Suitable for many models.
Product Information: The automatic air vent is a pressure safety measure the central heating unit. They work by using buoyancy to release an accumulation of air. As water flows through the heating/cooling system, a float within the automatic air vent opens or closes depending on the water level. If the system contains only water, the float will be pushed to the top and the vent will be closed until the water level drops.
Viessmann : WB1B 100-W Combi 26KW, WB1B 100-W Combi 30KW, WB1B 100-W Combi 35KW, WB1B 100-Wcombi26KW, WB1B 100-Wcombi30KW, WB1B 100-Wcombi35KW, WB1B 100-Wsystem26KW, WB1B 100-Wsystem30KW, WB1B 100-Wsystem35KW
ALPHA : INTEC 26C, INTEC 34C, INTEC 24X, INTEC 28 X, INTEC 12S, INTEC 28 S, INTEC 30 GS, INTEC 40GS, ECO 2, ECO 2 PLUS, INTEC 2 20SE, INTEC 2 25XE, INTEC 2 26CE, INTEC 2 28XE, INTEC 2 30CE, INTEC 2 30SE, INTEC 2 35CE