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When you're routing tubing through a crowded sump cabinet or building a custom aquarium filtration loop, a poorly fitted connector can mean leaks, lost livestock, and hours of rework. These 20mm PVC aquarium fittings are designed for hobbyists and workshop builders who need a dependable, solvent-weld socket connection on one end and a flexible barbed reducer on the other — so you can transition cleanly from rigid PVC pipe to soft tubing without adapters or tape.
Each fitting is molded from rigid PVC and is available in two socket configurations: a 20mm inner-diameter (ID) socket that accepts standard 20mm OD pipe, and a 20mm outer-diameter (OD) slip fitting for inside-socket installations. The barbed spigot end tapers to accept soft tubing in the 5–8mm (approximately 3/16"–5/16") inner-diameter range, creating a friction-secure, hose-clamp-ready seal. Available in Blue or White to match your build aesthetic, in single-piece or 5-piece packs.
Typical use cases include aquarium sump return lines, freshwater and saltwater filter plumbing, DIY pond circulation systems, and hydroponics irrigation manifolds — anywhere a compact 90° elbow or inline straight connector is needed to bridge rigid pipe and flexible tubing.
| Material | Rigid PVC (Polyvinyl Chloride) |
|---|---|
| Socket Size | 20mm Inner Diameter (ID) or 20mm Outer Diameter (OD) — see variant options |
| Barbed Spigot Range | 5–8mm inner diameter tubing (approx. 3/16"–5/16") |
| Connection Type (Socket End) | Solvent-weld (glue socket) |
| Connection Type (Barb End) | Barbed push-fit / hose-clamp compatible |
| Fitting Style | Elbow (90°) or Straight — see variant options |
| Color | Blue or White — see variant options |
| Pack Quantity | 1 pcs or 5 pcs — see variant options |
| Fluid Compatibility | Freshwater, saltwater, fertilizer solutions, non-pressurized aquarium plumbing |
| Max Recommended Pressure | See variant options |
| Operating Temperature | See variant options |
| Certifications | Contact us to confirm |
The 20mm ID (Inner Diameter) variant has a socket that fits over a pipe with a 20mm outer diameter — this is the most common slip-fit connection for standard 20mm PVC pipe. The 20mm OD (Outer Diameter) variant is sized to insert into a socket or fitting that has a 20mm inner bore. Measure your existing pipe or fitting opening before ordering to select the correct match.
The barbed spigot is designed to accept soft flexible tubing with an inner diameter of 5mm to 8mm (approximately 3/16" to 5/16"). The taper allows it to grip tubing across this range. For a more secure hold — especially in higher-flow applications — use a small hose clamp over the barb.
Yes. Rigid PVC is chemically resistant to saltwater, chlorine, and most aquarium additives. It will not corrode, rust, or degrade in typical reef or marine tank plumbing environments. Ensure the solvent-weld joint is fully cured before introducing water flow.
Use a standard PVC solvent cement (also called PVC glue or CPVC cement for low-pressure applications). Apply primer to both surfaces if required by your local plumbing code or if working with schedule-rated pipe. Allow the joint to cure fully — typically 15–30 minutes before handling and 24 hours before pressurizing — following the cement manufacturer's instructions.
Yes, the elbow variant provides a 90° change in flow direction. This makes it well-suited for routing tubing around corners in sump cabinets, behind tank stands, or through tight equipment spaces where a straight run is not possible.
Yes. PVC is widely used in hydroponics irrigation manifolds and pond circulation systems due to its resistance to fertilizer solutions, algaecides, and UV-stabilized water treatments. These fittings are suitable for low-pressure, gravity-fed, or pump-assisted systems typical of hobby-scale hydroponics and garden pond setups.
The 5-pack offers a lower per-fitting cost and is practical when building a new filtration system, replacing multiple connectors at once, or keeping spares on hand for maintenance. If you only need to replace a single failed fitting, the 1-piece option keeps your order cost minimal.
