Sierra Shieldsflex II 3/4" Water/Exhaust Sierra's Shieldsflex II Marine Water/Exhaust Hose has a black synthetic rubber tube and cover. The Shieldsflex II is primarily used for engine intake, bilge pump intake/discharge, scupper lines.Features: Reinforced with wire helix embedded between plies of HD synthetic cord.; Resistant to exhaust fumes, ozone, mild chemicals, antifreeze and saltwater. ; This hose is abrasion and odor permeation resistant; It now has double the ozone resistance required by the SAEJ2006; Specifications: I.D.:; 3/4" or 19mm; O.D.: ; 1 1/16" or 27mm; Ply: 2; Wt. "C": 32; Bend Radius: 5 x I.D.; Application: This hose is also used for wet exhaust connections (use where bends or long lengths are required).; This hose is also used for toilet intake/discharge, and holding tank vent/pump out.; The temperature ranges from -20F - +200F continuous, +250F intermittent; The hose meets SAEJ2006 Type R2 standards.