The pool hose adaptor is used to connect to your filter for back washing purposes. Simply screw in the hose adaptor into your multi port valve (40mm BSP) on your sand filter. Attach with a back wash hose using a stainless steel hose clamp. With the pump off, select back wash and turn pump on.
This adaptor can also be used on a Cartridge filter to empty your pool water by screwing the adaptor into the return side of your filter.