Automatic air vent valve with 1/2" check valve connection, without check valve the connection thread is 3/8" for use in THERMONA, DAKON, PROTHERM - 43544 / 40430 / 40430.1
Automatic air vent valve AIR 1/2" THERMONA - 43544
Possible uses in boilers:
THERMONA, DAKON, PROTHERM,