Sierra Silicone Double Hump Hose Coupler 6" The Silicone Double Hump Coupler 6" has a blue silicone cover with a smooth finish for easy clean up and fabric reinforced. The hose remains stable at elevated temperatures and provides angular and longitudinal vibration absorption in wet exhaust systems. Features: Shields couplers correct slight offsets in pipes; Resistant to exhaust fumes, ozone, mild chemicals, antifreeze, and saltwater; Temperature ranges from -20F to 350F; Meets SAEJ2006 Type R1 standards; Specifications Length: 14" or 356mm; I.D.: 6" or 152mm; lbs: 3;