Item: brass quick coupling Material: brass Thread: male Type: French Size: 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2" Gasket: NBR, Viton Express couplinds are symmetrical hale-couplings used for water or air applications complying with the NF E 29-573 standard. The two couplings are pushed together to form a seal. The claws of express couplings are spaced at a standard 41mm, and are not interchangeable with Geka and European air couplings.