Shields Nautiflex Silicone Exhaust/Water Hose has a blue silicone cover with a smooth finish for easy clean-up. This hose is flexible, easy to install, and has four plies of synthetic fabric. It also remains stable at elevated temperatures. Hose is primarily used for straight connections in the wet exhaust system and engine water circulation lines. The temperature ranges from -20°F – +350°F. Meets SAE J2006 Type R1 and ISO 13363:2004 – Type 2 – Class B standards. Sierra Part #116-202-3121.