Best Lily Pipe for a Planted Tank (Glass vs Steel vs PETG)

This is a research-based guide, not a hands-on test. We compare manufacturer specifications, current US retail listings, and the patterns that show up in published owner reports. We do not invent lab PAR maps, credentials, or prices. Amazon product links on this page use the Associates tag plantedtankreviews-20. You do not pay more when you use them. Retail prices move; we hedge dollar talk on purpose and tell you to check the live listing. Scope is freshwater planted-tank hardware. We do not stock livestock, review live plants as products, diagnose disease, or recommend medications.

US search interest for lily pipe and glass lily pipe is why this page exists. It is not a second copy of best filter for a planted tank. That pillar still decides hang-on-back versus canister. This page starts after the canister is already the plan: replace the stock spray bar and the ribbed black hose with an inflow and an outflow that fit the glass.

If the filter body is still open, stop here and read the HOB versus canister essay plus the named 10–20 gallon fight Fluval 107 vs AquaClear 50. An AquaClear 50 cannot take a lily-pipe kit. A Fluval 107 can, if the hose diameter is honest.

This page is the outflow upgrade. Keep every URL. Use the filter pillar when you are still choosing a body. Use this page when you already know the water will travel through a cabinet and you need glass, steel, or PETG to meet the rim.

What a lily pipe actually is

A lily-pipe set is two bent tubes and a pair of hose barbs:

1. Inflow. The intake. Horizontal slits or a slotted cage sit in the water column and feed the canister. A prefilter sponge can still go over it.
2. Outflow. The return. The classic piece is a flared "lily" bell that spreads flow along the surface or just under it. Jet-style steel returns and PETG outlets do the same job with a different silhouette.

Both pieces hook over the rim or sit on a rimless edge with suction cups or a clip holder. Clear vinyl or silicone hose hides behind the stand and meets the canister valves. The stock Fluval spray bar and the corrugated black hose are optional after that. They are not morally required.

A lily pipe does not filter water. It does not replace media. It does not replace the light or a CO2 kit. It shapes where the already-filtered water enters and leaves the display. That is the whole product.

People buy the set for three hardware reasons:

• The stock spray bar is ugly on a rimless tank.
• The stock return sandblasts a substrate hill.
• They want a gentler surface film break than a hang-on-back waterfall, especially if pressurized CO2 is already on the timer.

Those are flow-geometry problems. They are not a reason to buy a second canister.

This is not a hang-on-back page

Lily pipes need hose. A hang-on-back has a weir, not a hose run.

AquaClear 50 (B000260FUM) stays a waterfall. You can baffle it. You cannot thread a 17 mm glass outflow onto the box. If that is your filter, stay on the HOB versus canister page and the 107 vs AquaClear 50 compare. Do not add this kit to an AquaClear cart and hope.

Fluval 107 (B07JGLN6XC) is the named canister this site already verifies for 10–30 US gallons. It is the body this page sizes against. Larger 07-series canisters share the same AquaStop family. The hose story does not change just because the tank is a 20-gallon long. The 20-gallon hardware stack is still the shopping order: light, then filter, then this upgrade.

Internal power filters and sponge filters are a different product. They do not grow lily pipes either.

Hose sizing is the actual purchase

Listings shout "13 mm" and "17 mm." Those numbers are the outer diameter of the glass or plastic stem, not a tank-gallon rating and not a brand personality. The hose must stretch over that stem.

The two planted-tank sizes that show up on current US rows:

Stem OD on the listing	Hose the listing usually means	Common US nickname
13 mm	12/16 mm tubing	1/2-inch class
17 mm	16/22 mm tubing	5/8-inch class

A third size, 20 mm on 19/25 mm hose, exists for big canisters. This page does not pretend a 10–20 gallon Fluval 107 needs it.

Fluval 107 / 07-series AquaStop is a 16 mm / 5/8-inch class fit. Owner write-ups and Fluval's own clear-hose replacement parts treat the valve as 16 mm inner-diameter territory. The corrugated ribbed hose that ships in the box often looks smaller after the grey cuff, which is how people buy a 13 mm glass set, fail to seat it, and then blame the glass.

The honest Fluval 107 default on this page is a 17 mm set plus 16/22 mm clear hose, pushed onto the AquaStop after you retire the ribbed kit. That is the path published owner reports keep repeating: dump the black corrugation, run smooth 16/22, match the lily stem.

If you still want a 13 mm set on a 107, you need a documented 16/22-to-12/16 reducer and a short 16/22 stub at the valve. That is extra joints. Extra joints leak. We will not tell you that a reducer is "just as good." It is a workaround. Buy it only if you already own the 13 mm glass.

Do not invent a fit by heating 12/16 hose and jamming it over an AquaStop. Do not force 13 mm glass into 16/22 hose and call the gap "close enough." A lily pipe that pops off under a cabinet is a flood, not a style choice.

Measure the hose you will actually use, not the marketing name on the canister carton. 12/16 means about 12 mm inner diameter and 16 mm outer. 16/22 means about 16 mm inner and 22 mm outer. Listings swap "ID," "OD," and "3/4 inch" with cheerful incompetence. The FZONE 13 mm row has even printed "3/4 inch" next to 12/16 mm in a title. Believe the millimeter pair on the size variant, then dry-fit.

How we compared lily pipes

We scored the product ideas on:

1. Documented stem size. 13 mm versus 17 mm written as a size, not buried in a photo.
2. Material honesty. Borosilicate glass, 304-class stainless, or PETG — named, not "crystal clear premium."
3. Inflow plus outflow in the box. A single decorative outflow is half a kit.
4. Current US ASIN. If we cannot verify a live row, we omit the link rather than invent an ID.

We did not invent dissolution charts, "vortex maps," or street prices. Glass sets often live well below a mid-tier light. Steel hybrids and Neo Flow kits often sit in the same general band as a small add-on, not a second canister. Check the live listing.

Glass: the invisible default

Hand-blown borosilicate is the classic planted-tank lily. In water it disappears. Algae inside the tube does not. Cleaning means a spring brush, a soak, and a willingness to break a seventy-dollar-looking curve on a faucet. We will not publish a dollar figure. We will say glass is the material you buy when the sight line matters more than the sink.

JARDLI 17 mm glass inflow and outflow (B01G3A8V8S) is the named glass set this page verifies for 16/22 mm hose. The listing describes an upgraded slotted inflow, a flared lily outflow you can raise or lower for surface film, borosilicate glass, and four suction cups. Outer diameter is written as 17 mm for 5/8-inch / 16/22 mm tubing. That is the Fluval 107 size class.

JARDLI 13 mm glass inflow and outflow (B01FJI2U7S) is the sibling for 12/16 mm hose. Same product idea, smaller stem. Use it on canisters that actually ship 12/16, not as a hopeful Fluval 107 fit.

FZONE 17 mm glass kit (B09H2BW2K5) is the other named 16/22 mm glass row we can verify. FZONE's copy describes laboratory-grade borosilicate, a lily inflow and outflow, suction cups, and a spring brush. The brush is why this listing exists next to JARDLI: glass without a brush is a future order.

FZONE 13 mm glass kit (B09GY9XF2B) is the 12/16 mm FZONE row. Confirm the 13 mm / 12/16 mm variant. The title has been sloppy about inches. The millimeter pair is the SKU.

Where glass wins: rimless display tanks, matching a glass CO2 diffuser, and anyone who wants the hardware to vanish.

Where glass loses: households that bang pipes on a tap, anyone who hates visible algae in a clear tube, and anyone who treats suction cups as optional. Wet the stem before you push hose. Dry glass plus dry vinyl is how flares chip.

Glass is the right default when you will handle it like glass. It is the wrong default when you wanted "buy once, drop it in the sink forever."

Stainless: the pipe you can drop

Stainless lily and jet pipes are opaque on purpose. Algae still grows. You do not watch it through the wall. The trade is visibility: a brushed steel U is a design object, not an invisible one.

JARDLI hybrid stainless-and-glass 13 mm set (B0GMGYN73Q) is the named steel-family row we can verify. The listing describes a 304 stainless U-pipe with a detachable glass outflow and surface skimmer, a multi-level glass inflow, 360-degree outflow rotation, and a 13 mm stem for 1/2-inch / 12/16 mm tubing. That last clause matters: this verified row is the 13 mm hose class, not the Fluval AquaStop default. If your hose is 16/22, look for the matching 17 mm size on the live page or stay on the JARDLI 17 mm all-glass set. Do not invent a 17 mm steel ASIN because a photo looks similar.

Where steel wins: you break glass, you want a skimmer module you can pull, you like a modern industrial rim.

Where steel loses: you wanted invisibility, you bought the 13 mm hybrid for a 107 without a reducer, or the "304" in the title is the only quality claim and the welds look like a craft-fair straw. Cheap steel rusts at the waterline. If the listing cannot say a grade, skip it.

We are not going to pretend stainless "does not grow algae." It hides it. You still brush the intake slits.

PETG: Aquario Neo Flow as the modular pick

Aquario Neo Flow is a different product idea from a hand-blown lily. The pipes are PETG: clearer than most acrylic, more elastic than glass, and cuttable. Holders clip to the glass instead of living on suction cups alone. Outflow direction rotates. Optional Neo Skimmer, Reliever, Mixer, and Inlet parts bolt onto the same family.

Aquario Neo Flow Large, 17 mm (B09BNS1XSH) is the named PETG set for 5/8-inch / 16/22 mm hose. The listing describes cuttable PETG, a compact bend that sits close to the glass, removable sections, two holders, and the usual Neo accessory list. That is the Fluval 107 size class in this material.

Aquario Neo Flow Medium, 13 mm (B09BNR5P6G) is the 12/16 mm sibling. Same idea, smaller stem.

Aquario Neo Flow Premium Medium (B0CB8ZM6CW) is the kit that already includes a Neo Skimmer, Reliever, and holders on the 13 mm row. Confirm "Medium" and 13 mm / 12/16 mm in the live title. A Premium photo on a Large hose is the wrong object.

Neo Flow listings say the pipes look slightly cloudy dry and clear up wet. That is a material note, not a defect story we invented. They also scratch. PETG is not borosilicate. Treat it as a serviceable plastic, not heirloom glass.

Where Neo Flow wins: you want to cut height for a short tank, you want a skimmer later without buying a second inflow, you refuse to ship glass across the country.

Where Neo Flow loses: you wanted a classic flared lily silhouette, you will not read the holder instructions, or you bought Medium for a 107 because "medium" sounded like a 20-gallon. Medium is a hose size. Large is the 16/22 mm size.

ADA glass, VIV, and boutique jet pipes exist. We only affiliate-link current ASINs we can verify. If a regional row is messy, we omit it rather than mint an ID.

Inflow job versus outflow job

Do not buy an outflow and call the set done. The canister still has to drink.

Inflow slits should sit in open water, not buried in a wood pocket and not vacuuming the substrate hill. A prefilter sponge on the intake is still a good cheap habit: it catches plant fragments before the impeller. The filter pillar already says that. Lily pipes do not retire the sponge.

Outflow should run along the rear glass or across the long side so stems sway and the far corner moves. Pointing the flare at a Fluval Stratum slope is how people "discover" that soil clouds. That is aim, not brand.

Height is a lever:

• Bell just under the surface: gentle film movement, less splash, better CO2 hold if you already run a regulator-plus-solenoid kit.
• Bell breaking the surface: more film break, more gas exchange with the room, more noise.

There is no purity setting. A planted tank with a calm lid and leftover surface film wants a little more break or a skimmer module. A tank blasting CO2 into a waterfall already has a hang-on-back. This page assumes you chose the canister on purpose.

Spin outflows and "relievers" exist to slow a harsh return. Use them when the pump is stronger than the scape, not as a reason to buy an oversized canister "for later."

Surface film without a second motor

A lily outflow that kisses the surface is a film tool. A dedicated skimmer inflow is a different tool. Some JARDLI and Neo Flow rows add an acrylic cup that sits on the waterline and uses the canister's suction or the return stream to pull the slick.

That is still canister hardware. It is not a protein skimmer and not a livestock treatment. If the film is oil from your hands and food dust, skim. If the film is a symptom of zero surface movement, raise the outflow a few millimeters before you add another SKU.

HOB waterfalls already break the surface. That is why this page keeps sending AquaClear owners back to the filter compare instead of selling them glass.

CO2, heaters, and the rest of the stack

If you run pressurized CO2, put the ceramic disc or inline atomizer in the current the lily creates, not in a dead corner behind wood. The CO2 kit guide is the regulator page. This page only places the mist. An inline atomizer wants the same hose family as the lily. Adding a third diameter to that cabinet is how leaks multiply.

A heater belongs in flow you can inspect, not taped to the lily stem and not buried in soil. Glass plus a hot tube is a stress crack waiting for a water change.

Lights still decide whether the flow looks like a planted tank or an algae farm. Pair this upgrade with best planted tank lights 2026 and, if you are on a 20-gallon, the light-and-filter stack. A beautiful lily set on a 14-hour photoperiod is jewelry on a problem.

Listing check

Lily-pipe titles stack "13 mm," "17 mm," "skimmer," and "for Fluval" onto photos that reuse the same flare. Before you follow a plantedtankreviews-20 link on this page:

1. Stem versus hose. 13 mm stem = 12/16 mm hose. 17 mm stem = 16/22 mm hose. Fluval 107 AquaStop is the 17 mm / 16/22 class unless you add a documented reducer.
2. JARDLI 17 mm glass (B01G3A8V8S): confirm "17 mm" and 16/22 mm in the live title, and that the box is inflow and outflow, not a single decorative bell.
3. JARDLI 13 mm glass (B01FJI2U7S): confirm 13 mm / 12/16 mm. Do not buy this as a silent 107 fit.
4. FZONE 17 mm (B09H2BW2K5) and 13 mm (B09GY9XF2B): confirm the millimeter pair. Ignore inch poetry in the title if it fights 12/16 or 16/22.
5. Neo Flow Large (B09BNS1XSH) versus Medium (B09BNR5P6G): Large is 17 mm / 16/22. Medium is 13 mm / 12/16. "Premium" (B0CB8ZM6CW) is a kit contents word, not a hose size.
6. JARDLI hybrid steel (B0GMGYN73Q): the verified row is 13 mm / 12/16. If you need 16/22, confirm a 17 mm variant on the live page or stay on all-glass 17 mm.
7. Skip unnamed "crystal lily" bundles whose stem diameter is only in a lifestyle photo. If you cannot search the size, you cannot replace a suction cup.

We do not paste Amazon accessory checklists. Four suction cups in the photo are not proof they still ship. A brush in an FZONE title is a reason to open the live bullets, not a promise every generation includes one.

Before you click. Wet-fit language is missing from every title. Plan a bowl of water for the hose and the stem. Dry glass chips. Dry PETG still needs a shove. Steel barbs still cut cheap vinyl if you twist.

Buying notes the listing will not write

Suction cups die. Buy extras the same day if the brand sells them. Holders that clip the rim (Neo Flow) fail on extra-thick glass; listings often cap around 12 mm pane thickness. Measure the glass, not the tank gallon.

Hose length is a cabinet problem. Cut after you dry-fit the loop so the canister valves are not in a kink. Leave slack for a water change. A lily pipe that hangs from a taut hose is a lever on a suction cup.

Rimless tanks love lily pipes. Lidded tanks need holes. If the lid is glass, measure the cutout before you buy a tall inflow. The 20-gallon stack already told you to measure the top glass for the light. Do it again for the pipes.

Replacement is usually the whole glass piece, not a spare flare. Steel and PETG win here: you can pull a module. Glass is a consumable the first time it hits tile.

Do not run the outflow as a wave machine against a new aquasoil bed. Set the substrate first, then aim.

What we are not recommending

• Lily pipes on AquaClear 50 or any hang-on-back. Wrong object.
• 13 mm glass forced onto a Fluval 107 AquaStop. Wrong size.
• Mystery "universal" sets with no stem diameter.
• Acrylic pipes sold as glass. Acrylic scratches and clouds. If the listing says glass, the word should be borosilicate, not "crystal look."
• Buying ADA-priced glass from a marketplace seller with no model. We will not invent that ASIN.
• Skipping the inflow. An outflow-only cart is a half kit.
• Using the lily as a heater holster. See heater placement.

Which set for which canister

Situation	Research pick	Why
Fluval 107 / 07-series, want classic glass	JARDLI 17 mm glass set	Documented 17 mm / 16/22 mm, inflow and outflow
Same hose class, want a brush in the box	FZONE 17 mm glass kit	Same size story, cleaning tool on the listing
Fluval 107, refuse glass, want cuttable plastic	Aquario Neo Flow Large	PETG, 17 mm / 16/22 mm, holders
Canister that truly uses 12/16 mm hose	JARDLI 13 mm or Neo Flow Medium	Size match, not a 107 guess
12/16 mm hose plus skimmer in one cart	Neo Flow Premium Medium	Kit contents, still 13 mm
You break glass and your hose is 12/16 mm	JARDLI hybrid steel 13 mm	Opaque U, confirm the 13 mm row
Filter is still AquaClear 50	Do not buy lily pipes	Read the 107 vs AquaClear 50 compare

A 20-gallon high and a 20-gallon long take the same hose math. The tank name does not pick 13 mm.

Common setup mistakes

Keeping the ribbed Fluval hose "because it came in the box." The grey cuff is 16 mm class. The ribbing is ugly and it kinks. Smooth 16/22 mm hose is the lily-pipe partner.

Buying Medium Neo Flow for a 107 because the tank is "medium." Medium is 13 mm. Large is 17 mm.

Aiming the flare at the soil hill. Cloud city. Aim along the rear glass.

Mounting the inflow in the same corner as a ceramic CO2 disc so the canister eats the mist. Move one of them. See the CO2 kit guide.

Dry-fitting glass. Wet the stem. Push hose straight. Twist less.

Treating suction cups as forever. They let go after a heat cycle. Check them when you rinse media.

FAQ

Can I run lily pipes on AquaClear 50? No. AquaClear 50 is a hang-on-back. There is no canister hose for a lily stem. Keep the waterfall or change filter type first — Fluval 107 vs AquaClear 50.

What size for a Fluval 107? 17 mm stem and 16/22 mm hose, or a documented reducer if you already own 13 mm pipes. The AquaStop is not a 12/16 mm barb.

Do I need stainless to "keep shrimp safe"? Intake slit width and a sponge prefilter are the hardware. Material is not a livestock protocol. This site will not write one.

Will a lily pipe replace a spray bar on a stem tank? It can, if you aim it. A spray bar along the rear glass is still valid hardware. This page exists because people search for the glass upgrade, not because spray bars are forbidden.

Why won't you list a yeast-kit diffuser as a lily pipe? Because this page is about canister inflow and outflow pipes. A diffuser is a CO2 part.

What about Chihiros metal jets or UNS glass? They exist. We only affiliate-link current ASINs we can verify. If the live US row is messy, we omit the link rather than invent an ID.

Related hardware

Lily pipes are one rail on a canister. The body still comes from best filter for a planted tank and Fluval 107 vs AquaClear 50. A 20-gallon shopping order lives in best light and filter for a 20-gallon planted tank. CO2 placement lives in best aquarium CO2 kit. Heaters still need flow you can see — best aquarium heater for planted tanks. Lights still decide the week — best planted tank lights 2026 and Fluval Plant 3.0 vs Chihiros vs Twinstar.

A closing checklist

1. Confirm the filter is a canister with hose, not a hang-on-back.
2. Confirm stem OD: 17 mm for Fluval 107 / 16/22 mm, 13 mm only for true 12/16 mm hose.
3. Buy inflow and outflow together.
4. Retire the ribbed black hose. Dry-fit smooth tubing on wet glass.
5. Aim the return along the rear glass, not at the substrate hill.
6. Then stop shopping for a fourth material.

The best planted-tank lily pipe is the one whose hose diameter matches the valve you already own.