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When a plumbing run calls for a smooth transition between two different pipe diameters, a mismatched or off-center joint can cause turbulence, leaks, and long-term stress on the line. DIYers, plumbers, and irrigation installers who need a dependable eccentric reducer that keeps the pipe bottom flush — rather than centered — will find this fitting solves the problem cleanly and permanently.
Each bushing is molded from rigid white PVC (polyvinyl chloride), offering a wall thickness typically in the 3–5mm range depending on size. Available sizes span from 75×50mm (approx. 3"×2") up to 200×160mm (approx. 8"×6"), covering the most common residential and light-commercial pipe diameter reductions. The eccentric offset design keeps one side of the bore aligned flat, which is essential for gravity-drain and horizontal runs where air pockets must be avoided.
Typical applications include residential drain-waste-vent (DWV) plumbing upgrades, garden and agricultural drip-irrigation manifold assemblies, rainwater harvesting downpipe transitions, and pool or spa return-line reductions — all scenarios where a standard concentric bushing would trap air or create uneven flow.
| Material | Rigid PVC (Polyvinyl Chloride) |
|---|---|
| Color | White |
| Fitting Type | Eccentric Reducing Bushing |
| Connection Method | Solvent-Weld (Slip Socket) |
| Available Sizes (ID × ID) | 75×50mm / 110×50mm / 110×75mm / 160×110mm / 200×110mm / 200×160mm |
| Wall Thickness | See variant options |
| Pressure Rating | See variant options |
| Compatible Pipe Standard | Schedule 40 / SDR-35 PVC |
| Temperature Range | 0°C – 60°C (32°F – 140°F) for cold-water service |
| Pack Quantities | 1 / 2 / 3 / 5 / 10 Pcs |
A concentric reducer centers both pipe bores on the same axis, creating a symmetrical taper. An eccentric reducer offsets the bores so one side (the invert) stays flat. This is critical for horizontal drain lines because it prevents air pockets from forming at the top of the pipe, which would disrupt gravity flow. Use eccentric bushings on horizontal runs and concentric bushings on vertical drops.
Match the larger socket (first number) to your existing larger pipe's inner diameter, and the smaller socket (second number) to the smaller pipe you are transitioning to. For example, if you are reducing a 110mm pipe down to a 50mm branch, select the 110×50mm variant. When in doubt, measure the outer diameter of your pipe and cross-reference with standard PVC pipe sizing charts to confirm the inner diameter.
These fittings are molded from rigid PVC and are suitable for low-to-moderate pressure cold-water applications such as irrigation manifolds and residential DWV systems. For high-pressure supply lines, confirm the pressure rating of the specific size variant with us before ordering, as wall thickness and pressure capacity vary by size.
PVC is inherently corrosion-resistant and will not rust, rot, or react with most household chemicals and water treatments. Prolonged direct UV exposure can cause surface yellowing over many years; for outdoor above-ground installations, wrapping the fitting or painting with UV-resistant paint will extend its appearance and service life.
Use a standard PVC solvent cement (and PVC primer where required by local code) rated for the pipe schedule you are working with. Apply primer to both the pipe end and the socket interior, then apply cement and push the pipe firmly into the socket with a slight twist. Hold for 30 seconds and allow the joint to cure per the cement manufacturer's instructions before pressurizing the line.
Yes. The eccentric design makes it especially well-suited for gravity-drain and DWV applications, while the smooth bore and solvent-weld connection also work reliably in drip-irrigation manifolds, rainwater collection systems, and pool return lines. Ensure the pipe and fitting sizes match your system's flow requirements.
Multi-piece packs (2, 3, 5, or 10 Pcs) offer a lower per-unit cost and ensure you have spares on hand for future repairs or extensions without placing a new order. For larger projects — such as installing multiple irrigation zones or roughing in a full DWV stack — ordering a 5- or 10-pack upfront saves time and reduces the risk of project delays.
