ZYfire Fire Hose - 2-1/2" ID x 50 FT Double Jacket EPDM Firefighter Hose with M x F NST/NH Aluminum 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 NST NH aluminum couplings. One end of the fire hydrant hose is a 2 1 2" National Standard Thread (NST NH) female coupling, and the other end is a 2 1 2" NST NH male coupling. These couplings are made of aluminum, which is lightweight and highly durable. The jacket of the firefighter hose is made of double jacket 100% Virgin Polyester, which is abrasion