Sierra Shields Nautiflex Silicone Exhaust Hose 1-14 Sierra Shields Nautiflex Silicone Exhaust Hose has a blue silicone cover w smooth finish for easy clean up. The Nautiflex hose is flexible, easy to install and has four piles of synthetic fabric and remains stable at elevated temperatures. Specifications O.D. 1 58 or 41mm I.D. 1 14 or 32mm Wt. C 41.3 The temperature ranges from -20F - 350F Length 3 or .9m Applications Primarily used for straight connections in the wet exhaust system engine wat