P21X—1.2W-L8 type  Automatic Air Vent, used for heating pipes.  It has eight edge, the casing adopt aluminlum alloy and pressure casting into pattern, which is pressure proof, rust less,small in volume.

Working pressure：≤1.2Mpa

Applicable temperature：≤109℃

Available exhaust bore：Ф2mm

Installation connection：ZG3/4″ 

Outline dimensions：Ф86mm×103mm