Full flow pipe to hose adapters are used for connecting hose to valve, seacocks, strainers or any hardware having female NPT pipe threads. FF and FFC fittings are designed to accommodate the designed full pipe size flow and to provide an unrestricted passage through the fitting. If a 3/4" fitting is to provide full flow through the fitting, and also have a save wall thickness, the fidding OD must be larger than 3/4". Therefore, a hose ID larger than the pipe size is required. Fittings are cast bronze. A hex nut is cast-in to allow for secure tightening. Pipe Size": 1-1/4 Desc.: Straight Hose ID": 1-1/2 GROSS MECHANICAL FF1250, GROFF1250 MODEL NO - FF1250