ZYfire Fire Hose - 2-1/2" ID x 50 FT Double Jacket EPDM Firefighter Hose with M x F NPSH Brass Couplings 1200 PSI Burst Pressure Lightweight for Firefighting & Residential Use" The package you received includes: 2 1 2" ID x 50 FT double jacket EPDM fire hose with M F NPSH aluminum couplings. One end of the fire hydrant hose is a 2 1 2" National Pipe Straight Hose (NPSH) female coupling, and the other end is a 2 1 2" NPSH male coupling. These couplings are made of brass, which is corrosion resistant, high temperature ductile, and low magnetic permeability. The jacket of the firefighter hose is made of double jacket 100%