PVC Eccentric Reducer Water Supply Pipe Fittings 25-63mm Offset Tube Connector

A concentric reducer tapers symmetrically around the pipe centerline, creating a step on all sides. An eccentric reducer offsets the bore so one flat side of both pipes aligns on the same plane. In horizontal pressurized water supply runs, this flat-side alignment prevents air from becoming trapped at the transition point, which can cause water hammer, reduced flow, and noisy pipes. For vertical runs, a concentric reducer is typically acceptable; for horizontal runs, eccentric is the correct choice.

The first number in each size pair (e.g., 50mm in "50×32mm") is the larger socket — this connects to your existing larger-diameter supply pipe. The second number (32mm) is the smaller socket — this connects to the downstream or branch pipe. Measure the outer diameter of each pipe before ordering, as nominal pipe sizes and actual ODs can vary slightly by standard and manufacturer. When in doubt, dry-fit before cementing.

Yes. This fitting is made from rigid PVC formulated for water supply (pressure) service, unlike DWV-grade PVC which is non-pressure rated. The working pressure rating varies by size — larger diameters generally have lower pressure ratings at the same wall thickness. Check the specific variant's pressure rating against your system's operating pressure before installation, particularly for sizes above 50mm.

Rigid PVC is inherently corrosion-resistant and does not rust, pit, or scale. It is non-reactive with potable cold water and resists most common water treatment chemicals at normal concentrations. PVC is not recommended for continuous hot-water supply lines (above approximately 60°C / 140°F) — for those applications, CPVC or other heat-rated materials are required.

For horizontal water supply runs, orient the flat side of the eccentric reducer facing downward. This keeps the bottom of both pipes flush and level, preventing air accumulation at the top of the transition. Mark the flat side with a marker before applying primer and cement so you can confirm orientation during the brief window before the joint sets.

Cut both pipe ends square and deburr the edges. Dry-fit the reducer to confirm socket depth and mark the flat-side orientation. Apply PVC primer to both pipe ends and both sockets, then apply PVC cement to all four surfaces. Insert each pipe end with a slight quarter-turn twist and hold firmly for 30 seconds. Allow the joint to cure fully per the cement manufacturer's instructions — typically 15–30 minutes before handling and 24 hours before full pressure testing.

For a single pipe repair or one transition point, the 1-piece option covers the job. For roughing in a bathroom or kitchen group with multiple fixture branches stepping down from a common supply main, the 3 or 5-piece pack provides the quantity needed plus a spare in case of a mis-cut. The 10-piece pack is suited for irrigation manifold builds, multi-zone systems, or trade use where the same size reduction repeats across multiple runs.