These quick couplers are made specifically for hoses with an inner diameter (ID) of 1" (or 1-1/4") and an outer diameter (OD) of 1-7/8". Aluminum material is pliant and strong and weighs less than brass. Aluminum couplers provide the strength and durability you expect from Clemco without adding too much extra weight to the hose assembly. These aluminum couplings are injection molded for precise dimensions, ensuring a positive fit. Our authentic Clemco aluminum couplings are industrial strength and guaranteed to fit appropriately-sized blast hoses and piping. CQ Couplings include gasket, screws, and lock pin.