European air couplings is a kind of symmetrical half coupling for  comprised air use. Operation of this kind of coupling is pushed two couplings and rotate close into a seal form.      It is popular in  European market with carbon steel and stainless steel.   The claw lug distance is 21 mm for all size.
Application
European air coupling are widely used in the transfering of compress air.
Material
1. stainless steel
2.carbon steel
Seal
1. As standard the coupling in stainless steel have a black viton sealing ring
2. The brass coupling is with a black NBR sealing ring
Thread
1. Female thread BSP EN ISO 228-1
2.Male thread BSP EN ISO 228-1