Shields Single and Double Hump Couplers have a blue silicone cover with a smooth finish for easy clean up and are fabric reinforced. They remain stable at elevated temperatures and provide angular and longitudinal vibration absorption in wet exhaust systems. Shields couplers correct slight offsets in pipes. Resistant to exhaust fumes, ozone, mild chemicals, antifreeze and saltwater. Temperature range is -20 degreesF to +350 degreesF. Meets SAE J2006 Type R1 standards. Style Single Hump ID 4" Length 6"