1/2 inch BSP Sink Tap Back Nut

PLEASE NOTE: THIS IS A BSP THREAD AND DOES NOT MEASURE 1/2 INCH IN DIAMETER Most plumbing products thread sizes are stated as BSP imperial thread measurements which means that the actual diameter of the thread is approximately 1/4 inch larger than that stated in BSP terms. For example the thread on this product has an actual thread diameter of approximately 3/4 inch. If you require one with an actual diameter of 1/2 inch you will require a 1/4 inch BSP thread. Large diameter flange to maximise contact with against sealing washers to create a more stable seal. Replaces plastic or nylon backnuts fitted to many plumbing threads Generally for use on sink and basin taps often with an incoming water pipe diameter of 15mm