These quick couplers are made specifically for hoses with an inner diameter (ID) of 1-3/4" and an outer diameter (OD) of 2-3/32". Fiber-reinforced nylon couplings are a lightweight alternative to metal couplings. Despite their lighter weight, Clemco’s nylon couplings provide industrial strength and are able to spring back from most impacts that would damage metal. 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.