Sierra Shieldsaust-C 4-12 x 12-12 Sierra Shieldsaust - C 1 Hose has a black synthetic black tube and cover. The Shieldsaust - C Hose is reinforced with double wire helix embedded between plies of synthetic cord and is abrasion resistant. Specifications I.D. 4 12 or 114mm O.D. 5 18 or 130mm Wt. C 278 Ply 2 Bend Radius 4 x I.D. Burst Pressure 175 PSI Working Pressure 60 PSI The temperature ranges from -20F to 200F continuous, 250F intermittent Applications Primarily used for wet exhaust connection