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When your pipe run changes diameter and you need a clean, leak-free transition without cutting into walls or re-routing an entire line, a mismatched or missing reducer bushing turns a simple job into a frustrating one. These PVC eccentric reducing bushing fittings are designed for DIYers, plumbers, and irrigation installers who need a dependable solvent-weld connector that seats flush and holds pressure without guesswork.
Each bushing is molded from Polyvinyl Chloride (PVC) in a grey finish. The eccentric (off-center) bore design keeps the bottom of both pipe ends level, which is critical for drainage applications where self-draining flow matters. Sizes span from 25×20 mm (approx. 1" × ¾") up to 90×75 mm (approx. 3½" × 3"), covering the most common residential and light-commercial pipe diameter steps. Wall thickness is proportional to pipe diameter and follows standard Schedule-equivalent PVC tolerances.
Typical use cases include residential drain-waste-vent (DWV) step-downs, garden drip-irrigation manifold reductions, and workshop compressed-air line diameter changes — all scenarios where a long-tail search like "PVC reducing bushing eccentric 40mm to 32mm" or "grey PVC pipe reducer connector joint" leads builders straight to this fitting.
The off-center bore keeps the pipe invert (bottom) level across both diameters, ensuring self-draining flow in horizontal DWV and drainage runs — no trapped water pockets.
13 Size Options in One ListingFrom 25×20 mm up to 90×75 mm, covering the most common residential pipe step-downs. Select the exact size you need without ordering from multiple suppliers.
Solvent-Weld Socket EndsBoth the spigot and socket ends accept standard PVC solvent cement for a permanent, pressure-rated bond that resists vibration and thermal cycling.
UV- and Moisture-Resistant PVCGrey PVC formulation resists moisture absorption and handles typical outdoor temperature swings, making it suitable for above-ground irrigation and drainage installations.
Flexible Pack QuantitiesAvailable in 1, 2, 3, 4, 5, 8, 10, 15, or 20-piece packs so you can order exactly what your project requires — no leftover stock, no short supply.
Consistent Molded TolerancesEach bushing is injection-molded to consistent dimensional tolerances, ensuring a snug socket fit with standard PVC pipe without sanding or shimming.
| Material | Polyvinyl Chloride (PVC) |
|---|---|
| Color / Finish | Grey |
| Connection Type | Solvent-weld (socket × spigot) |
| Bore Type | Eccentric (off-center) |
| Available Sizes (mm) | 25×20, 32×20, 32×25, 40×20, 40×25, 40×32, 50×20, 50×25, 50×32, 50×40, 63×50, 75×63, 90×75 |
| Size Range (approx. inch) | ¾"×½" up to 3½"×3" |
| Wall Thickness | See variant options |
| Working Pressure | See variant options |
| Temperature Range | See variant options |
| Pack Quantity Options | 1 / 2 / 3 / 4 / 5 / 8 / 10 / 15 / 20 Pcs |
| Weight (per piece) | See variant options |
Measure the outer diameter (OD) of both pipes you need to join. The larger number in the size (e.g., "40" in 40×25 mm) is the socket end that accepts the larger pipe; the smaller number is the spigot end that inserts into the smaller pipe fitting. Always verify OD against the size listed before ordering.
A concentric bushing centers both pipe bores on the same axis, creating a step on all sides. An eccentric bushing offsets the bore so one side (the invert/bottom) stays flat. This is essential for horizontal drainage lines because it prevents low spots where water and debris can pool.
A properly made solvent-cement joint on PVC typically exceeds the burst strength of the pipe itself. Apply a thin, even coat of PVC primer (where required by local code) followed by PVC solvent cement to both the spigot and socket surfaces, push together with a quarter-turn, and hold for 30 seconds. Allow the joint to cure per the cement manufacturer's instructions before pressurizing.
Grey PVC is moisture-resistant and handles typical outdoor temperature ranges. For direct burial, ensure the fitting is rated for underground use per your local plumbing code. For prolonged UV exposure above ground, consider painting or wrapping the fitting, as extended direct sunlight can cause surface chalking over time.
These fittings are well-suited for DWV (drain-waste-vent), irrigation, and non-potable water drainage applications. For potable (drinking) water supply lines, verify that the specific fitting and cement you use carry the appropriate NSF/ANSI 61 certification required in your jurisdiction.
For a single connection point, 1 Pc is sufficient. For multi-branch irrigation manifolds or whole-house drain rough-ins, ordering a 5- or 10-pack reduces per-unit cost and ensures you have spares on hand for any re-dos. The 15- and 20-pack options offer the best per-piece value for larger installations or trade use.
These bushings are dimensioned to fit standard metric PVC pipe OD sizes (25 mm, 32 mm, 40 mm, 50 mm, 63 mm, 75 mm, 90 mm). If you are working with imperial Schedule 40 pipe, compare the actual OD of your pipe to the bushing socket diameter before ordering, as nominal sizes can differ between metric and imperial standards.
