Hozelock Non Return Outdoor Tap Connector - 2181The Hozelock non return valve fits directly to an outdoor tap and is designed to prevent the backflow of contaminated water back into the main water supply. Has a Hozelock male quick click connection (removable). Suitable for use on standard garden taps with either a 1 2" or 3 4" male BSP thread outlet. Approved by the water research council. Product Details: Male Hozelock quick click connection. Prevents backflow of dirty water. Fits to standard