Waste for Caravans and Boats: 50mm White Plastic Flange: ¾" BSP thread: Plug: Special Locking Nut Size: ½" Flange Size: 50mm Please Note: This Waste has a plain tail and can be fitted into any 1¼" (1.1/4") x 75mm water seal Adjustable Inlet Trap - e.g. AA10. Remove standard adjustable inlet supplied and substitute Fitting