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Managing water flow between mismatched pipe sizes is one of the most frustrating challenges for aquarium builders, pond installers, and DIY plumbing enthusiasts. Whether you're upgrading a sump system, building a koi pond, or routing drainage lines, these 140mm to 110mm PVC reducer fittings give you a clean, leak-resistant transition without custom fabrication.
This listing includes 8 pieces of PVC reducer couplings, each designed to connect 140mm (approximately 5.5 in) outer-diameter pipe down to 110mm (approximately 4.3 in) pipe. The fittings are constructed from rigid PVC, offering a smooth interior bore for unobstructed flow. Wall thickness is typically 3–5mm depending on the variant selected.
Typical applications include aquarium sump overflow plumbing, koi pond filtration pipe runs, rainwater harvesting downpipe reducers, and irrigation system branch transitions. The slip-fit socket design makes these fittings compatible with standard PVC solvent cement for a permanent, watertight bond in both wet and dry installations.
| Material | Rigid PVC (Polyvinyl Chloride) |
|---|---|
| Fitting Type | Reducer Coupling (Slip-Fit Socket) |
| Inlet Size | 140mm (~5.5 in) OD |
| Outlet Size | 110mm (~4.3 in) OD |
| Wall Thickness | See variant options |
| Overall Length | See variant options |
| Color/Finish | See variant options |
| Connection Method | PVC Solvent Cement (not included) |
| Quantity per Pack | 8 pieces |
| Application | Aquarium, Fish Tank, Pond, Drainage, Irrigation |
| Pressure Rating | See variant options |
| Temperature Range | Typically 0°C to 60°C (32°F to 140°F) |
These reducer fittings are designed to connect 140mm outer-diameter pipe to 110mm outer-diameter pipe. Both ends use a slip-fit socket design intended for use with PVC solvent cement. Always verify your pipe's actual OD before ordering, as nominal pipe sizes can vary by standard (DIN, AS/NZS, etc.).
Yes. The fittings are made from rigid PVC, which is non-toxic and widely used in aquatic plumbing. After solvent cementing, allow the joint to fully cure per the cement manufacturer's instructions (typically 24–48 hours) before introducing water or fish to ensure no residual fumes remain.
Yes. PVC is inherently corrosion-resistant and does not react with saltwater, chlorinated water, or most common pond treatments. These fittings are suitable for both freshwater and saltwater aquarium plumbing, as well as outdoor koi ponds and water features.
Use a standard PVC solvent cement (also called PVC glue or CPVC cement for cold-water applications). Apply primer first if required by your local plumbing code. Solvent cement is not included with this listing. Follow the cement manufacturer's cure time before pressurizing the system.
A properly solvent-cemented PVC joint is typically stronger than the pipe itself. The chemical welding process fuses the fitting and pipe into a single continuous piece. For gravity-fed aquarium and pond systems, a cemented PVC reducer fitting provides a permanent, leak-proof connection under normal operating conditions.
Yes, all 8 fittings in the pack are the same 140mm-to-110mm reducer coupling. This makes the pack ideal for installations requiring multiple identical transition points, such as multi-tank aquarium systems, pond manifolds, or drainage arrays.
Measure the actual outer diameter of your existing pipe with calipers. If your pipe measures approximately 140mm OD on the larger end and 110mm OD on the smaller end, these fittings are compatible. If you're unsure, contact us to confirm compatibility before ordering.
