New CONTINENTAL Jackhammer Air Hose: EPDM, 3/4 in Hose Inside Dia., 50 ft Hose Lg, Red, 3/4 in x 3/4 in Fitting Size Item #45RK69 Mfr. Model #45RK69 These jackhammer hoses have a tube and cover made from EPDM (ethylene propylene diene monomer), which provides excellent resistance to ozone, good resistance to chemicals and heat, and poor resistance to petroleum fluids (area 53)