Provides controlled diversion of 2 x 38mm lines into one or vice versa. Typical uses include connection of one bilge pump to two separate bilge areas or installation in a toilet system to control discharge to holding tank, or deck waste pump out, or discharge overboard (if permitted). Manufactured from ABS plastic to retain odours. Stainless steel fastenings used throughout. Locking tab enables the valve to be locked in one line open position. Valve configuration has common port always open with one of the other ports selectably open or both open. It is only possible to close one port at any one time.