These reusable fittings thread on to their corresponding hose size, making a seal against the internal barb and being held in place by the threads. Nominal end fittings can refer to flared tubing, adapters, etc. Can be used with 201, 206, 225, 266, 221FR, and SS25UL hoses These fittings contain a dual seat that accepts both the JIC (37) and SAE (45) male configurations