Nitrous Oxide 3ft. Hose - Nitrous Oxide 4ft. Hose - DISS x DISS The Hose Assemblies are manufactured with FDA approved medical grade thermoplastic conductive rubber tubing. The tubing is reinforced with nylon braiding. The maximum working pressure is upto 55 psi for all gases except for Nitrogen, Nitrogen hoses have a working pressure of upto 200 psi. The burst pressure rating is between 200-250 psi @70º F. The tubing is color coded to conform to CGA C-9 standard. The fittings are permanently crimped on each end with ferrules.