Milton 3/8" MNPT 3/8" ID Hose End Fitting,2/card. 3/8" MNPT brass hose ends have a 3/8" ID hose and barb. Brass hose fittings are used to assemble new hoses or replace old fittings on hoses. A hose clamp may also be used but is not as desirable. For best results and professional finished product the hose end should be secured with a crimped ferrule.