These quick couplers are made specifically for hoses with an inner diameter (ID) of 3/4" and an outer diameter (OD) of 1 1/2". Brass is a moderately strong and tough metal with corrosion resistance and ductility. Our authentic Clemco brass couplings are industrial strength and guaranteed to fit appropriately-sized blast hoses and piping. CQ Couplings include gasket, screws, and lock pin.