The AR1265890 Aluminum Inlet By-Pass Adapter is the lower water intake fitting that the garden hose attaches too. This AR1265890 Aluminum Inlet is also the By-Pass adater for the unloaders by-pass system to operate.The AR1265890 was used on the older Cobi-Set unloaders including the AR2944, AR2973, AR2924, AR2946 and others.