The McAlpine BT3V 75mm Water Seal Tubular Low Inlet Swivel 'P' Anti-Syphon (Silentrap) Trap is a plumbing component used to prevent sewer gas and foul odors from entering a building through the drainage system. The trap features a water seal that prevents the escape of sewer gas by creating a barrier between the plumbing system and the outside air. The swivel 'P' design allows for flexibility in installation, making it ideal for use in tight spaces. The anti-syphon (Silentrap) feature ensures that the trap remains full of water, even under conditions of low pressure, to maintain the water seal and prevent the entry of sewer gas. The trap has a 1¼" Multifit Outlet, which means that it can be connected to a range of pipe sizes and types, making it a versatile plumbing component. Overall, the McAlpine BT3V 75mm Water Seal Tubular Low Inlet Swivel 'P' Anti-Syphon (Silentrap) Trap is a reliable and effective solution for preventing the entry of sewer gas and foul odors into a building's plumbing system. ・ 75mm Water Seal ・ 1¼" Multifit Compression Outlet suits all plastic, copper and lead pipe ・ Low Inlet allows for installation of a 75mm Water Seal Trap on a Bidet ・ Anti-Syphon (Silentrap). ・ Manufactured in polypropylene