Item: Quick Express Couling Material: brass Type: French type Size: 3/8" ... 1/4", 1-1/2" Gasket: NBR, Viton Item: Quick Express CoulingMaterial: brassType: French Thread: FemaleSize: 3/8" , 1/2 ... 1-1/2ā€¯Gasket: NBR, Viton,Package: Carton Express Couplings are symmetrical half-couplings used for water and air ... and rotated to form a seal. The claw of express couplings are spaced at a standard 41mm, and are ...