PVC Eccentric Reducing Bushing — Reliable Step-Down Connections for Every Pipe Run
When your plumbing layout demands a smooth transition between two different pipe diameters without shifting the pipe centerline, a standard concentric bushing simply won't do. These PVC eccentric reducing bushings keep one side of the bore flush, making them the go-to choice for DIYers, plumbers, and workshop builders who need precise, drip-free step-down joints in drainage, irrigation, and low-pressure water supply lines.
Manufactured from rigid PVC, each bushing features a slip-fit socket on the larger end and a spigot on the smaller end. Outer diameters span 25 mm to 90 mm (approx. 1" to 3½") with inner diameters from 20 mm to 75 mm (approx. ¾" to 3"), covering 16 size combinations. Wall thickness typically ranges 2–4 mm depending on size. Available in White, Blue, and Grey to match existing pipework or colour-code systems.
Ideal use cases include residential drain-waste-vent (DWV) step-downs, garden irrigation manifold transitions, workshop compressed-air distribution lines, and aquarium or pond plumbing where eccentric offset is required to maintain a flat invert for self-draining runs.
✅ Key Features of These PVC Eccentric Reducing Bushings
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16 Size Combinations
From 25*20 mm up to 90*75 mm — one listing covers the full range of common metric step-down transitions.
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3 Colour Options
White, Blue, and Grey let you match existing pipework or colour-code systems for quick visual identification.
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Eccentric Offset Design
One side of the bore stays flush, maintaining a flat invert for self-draining runs — critical in DWV and gravity-fed irrigation layouts.
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Rigid PVC Construction
Corrosion-resistant, lightweight, and compatible with standard PVC solvent cement for a permanent, leak-free bond.
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Flexible Pack Sizes
Order 1, 2, 5, or 10 pieces per variant — ideal for single repairs or bulk project stocking.
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Slip-Fit Socket × Spigot End
Standard slip-fit socket on the large end accepts pipe OD; spigot end inserts into the next fitting — no special tools required.
❓ Frequently Asked Questions
What is the difference between an eccentric and a concentric reducing bushing?
A concentric bushing centres both pipe bores on the same axis, creating a symmetrical step-down. An eccentric bushing offsets the bores so one side remains flat (flush invert). This is essential in horizontal drain lines where you need the pipe bottom to stay level for gravity flow and to prevent air pockets.
How do I choose the right size?
Match the larger socket end (OD) to your existing pipe's outer diameter, and the smaller spigot end (ID) to the pipe you are stepping down to. For example, if you are reducing a 50 mm pipe to a 32 mm pipe, select the 50*32 mm variant. When in doubt, measure your pipe OD with calipers rather than relying on nominal pipe size labels.
Can I use solvent cement with these bushings?
Yes. These bushings are compatible with standard PVC solvent cement (CPVC cement is not recommended for standard PVC). Clean and dry both surfaces, apply a thin, even coat of primer if required by local code, then apply cement and push firmly with a quarter-turn. Hold for 30 seconds and allow to cure per the cement manufacturer's instructions before pressurising.
Are these bushings suitable for hot water or high-pressure applications?
These are rigid PVC fittings rated for cold-water and low-pressure applications such as drainage, irrigation, and vent lines. They are not recommended for hot water supply lines (above ~60 °C) or high-pressure systems. For hot or high-pressure applications, consider CPVC or brass fittings.
Will the colour affect performance or UV resistance?
The colour is a pigment added during manufacturing and does not affect the mechanical or chemical properties of the PVC. However, standard PVC is not UV-stabilised; for outdoor exposed installations, paint over the fitting or use UV-resistant PVC. The colour options (White, Blue, Grey) are primarily for system identification or aesthetic matching.
How many pieces should I order for a typical repair or project?
For a single repair or test fit, order 1–2 pcs. For a full plumbing rough-in or irrigation manifold build with multiple step-down points, the 5- or 10-piece packs offer better value per unit. Check your pipe layout plan and count each unique size transition before ordering.
🛒 Select your colour and size above, then add to cart.
