Dymax Stainless Steel Lily Pipe Set, 16/22mm

Surgical-Grade Stainless Steel Lily Pipe Set for Larger Planted Tank Canister Filters

The Dymax Stainless Steel Lily Pipe Set (16/22mm) is a matched inflow and outflow pipe set for external canister filters running 16mm inner diameter / 22mm outer diameter tubing — the standard hose size for larger-capacity canister filter models used on mid-size to large planted tank builds. It is the same surgical-grade stainless steel construction as the 12/16mm set: resistant to rust, scratches, calcium buildup, and the chemical environment of both acidic and alkaline planted tank water.

The larger 16/22mm diameter accommodates the higher flow rates of bigger canister filters, maintaining the lily pipe outflow's circular surface agitation across a wider cross-section of return flow. For planted tanks of 50 gallons or more running a high-flow canister, the 16/22mm set delivers the same benefit as the smaller size — clean surface movement for gas exchange and CO2 distribution — at the scale that matches the system's filtration output. The outflow lily pipe's flared bell design creates a circular surface current; the inflow pipe draws water from the lower tank into the canister for processing. Hose clips are included for secure connection at both ends.

Stainless steel lily pipes occupy the premium tier between plastic inflow/outflow fittings and glass lily pipes. Plastic is durable but visually heavy and prone to discoloration. Glass is visually refined but fragile — a single contact with a hard object during cleaning or tank maintenance can shatter the pipe mid-build. Stainless steel is both visually clean and genuinely robust, with the additional advantage of calcium and chemical resistance that glass does not provide.

Key Features:

• Surgical-grade stainless steel outflow and inflow lily pipe set for larger canister-filtered planted aquariums
• Sized for 16mm ID / 22mm OD canister filter tubing
• Outflow lily pipe creates circular surface agitation for gas exchange and CO2 distribution at higher flow rates
• Resistant to rust, scratches, calcium buildup, acidic water, and alkaline water
• Durable premium alternative to both plastic fittings and fragile glass lily pipes
• Includes outflow lily pipe, inflow lily pipe, and hose clips
• Clean stainless aesthetic suited to mid-size and large Nature Aquarium and Dutch-style builds

Ideal For:

• Planted tank builds in the 50 to 100+ gallon range running a larger external canister filter with 16mm ID / 22mm OD tubing, where a premium stainless steel inflow and outflow set is the right visual and functional upgrade over standard plastic fittings
• Advanced aquascapers running a large Nature Aquarium or Dutch layout who want the cleanliness of a lily pipe visible in the tank without the glass breakage risk that comes with maintenance and water changes on a larger system
• Hobbyists upgrading from plastic inflow/outflow to stainless steel for better longevity, calcium resistance, and visual quality on an established large planted tank

Pro Tips:

• Use the same citric acid cleaning method as the 12/16mm set. Calcium deposits accumulate faster on larger-diameter pipes at higher flow rates because more water volume passes the steel surface per unit of time. A monthly citric acid soak — diluted in water, brief soak, thorough rinse — keeps the 16/22mm set visually clean and flowing at full capacity longer than relying on manual scrubbing.
• Confirm your canister filter uses 16mm ID / 22mm OD tubing — not 16/22mm in another measurement convention. Some manufacturers label hose sizes by inner diameter only; others by outer diameter only. The 16/22mm designation on this set refers to 16mm inner diameter and 22mm outer diameter. Measure your existing hose's outer diameter with calipers to confirm the 22mm OD before ordering.
• Position the inflow intake away from CO2 diffusor output. On larger tanks, there is more flexibility in equipment placement. Avoid positioning the canister intake directly in front of the CO2 diffusor — it will pull CO2 bubbles into the canister before they dissolve, reducing CO2 efficiency and increasing the chance of CO2 gas locks in the canister filter body.