Nipple with built-in check valve 3000 - 12mm John Guest connection

Nipple with built-in check valve 3000 - 12mm John Guest connection Nipple with built-in non-return valve that lets air in when draining the water heater. Nipple with built-in non-return valve that lets air in when draining the water heater. Mounted on the outgoing nipple connection. Incl. 500 mm hose for aeration. Ø 10 mm hose connection. Fits Compact 3000 and 3010 up to and including serial no. 91458. AL-3000471 AL-3000571