60" Enviro-Guard™ Hose, 3/8" FFL, with standard straight fittings – Black. These larger diameter hoses reduce pull-down time by as much as 40%. Enviro-Guard Hoses are constructed of special barrier material which prevent virtually any permeation of refrigerant, yet remains flexible. Meet all specifications for low permeation construction. 740 psi working pressure, 3700 psi burst pressure.