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Debenhams£4.71Visit shop Mcalpine Unisex White Bn3 1.5" Plastic Backnut With Rubber Washer 1.75" Bs
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The McAlpine BN3 Backnut with Rubber Washer is an essential plumbing component for homeowners and trade professionals looking to ensure secure, leak-free pipe connections in kitchen and bathroom fixtures. Designed for reliability and ease of use, this backnut features an extended 85mm flange for superior stability during installation, though users should ensure they are pairing it with compatible threaded fittings to maintain a proper seal.
| Colour | White |
|---|---|
| Model Part Number | BN3 |
| Brand | McAlpine |
No, the BN3 is designed to be used with the included rubber washer which provides the necessary seal without the need for additional tape.
The BN3 is designed for standard interior kitchen and bathroom sanitary installations and is not rated for outdoor, pressurized main lines.
The flange is 85mm in diameter, providing an extended surface area for enhanced stability.
The BN3 is a high-durability plumbing-grade plastic component manufactured by McAlpine.
Ensure the threads are aligned perfectly. If it resists, back it off completely, clean the threads, and try threading it again slowly.
Check that the threads are clean and free of debris, and ensure you are not cross-threading the nut during initial engagement.
Remove the nut and inspect the rubber washer for tears or debris. Ensure the washer is seated flat against the sink surface and re-tighten firmly by hand.
To install the BN3, first ensure that the threaded tail of your plumbing fixture is clean. Slide the rubber washer onto the fixture followed by the BN3 backnut. Thread the nut clockwise until it makes firm contact with the mounting surface.
*Compatibility*: This unit is intended for standard sanitary plumbing fittings. Always verify that the thread pitch matches your existing waste or pipe component before forcing the nut into position.
*Care*: Avoid using aggressive chemical drain cleaners directly on the backnut, as these can degrade the plastic threads over time. Periodically check that the nut remains tight, especially in installations subject to vibration or temperature fluctuations, as these can cause slight loosening over months of use.
