Black Silicone Coolant Bypass Cap, 1 1/8 inch ID 20721 Hand-crafted and quality inspected to

Hand-crafted and quality inspected to the highest European standards

The 114mm ID at one end and 89mm ID at the other end let you connect a 4 1/2" OD tube to a 3 1/2" OD tube

so this hose is popular as engine intake plumbing on normally-aspirated applications

These 45 degree reducer elbow hoses have a 38mm ID at one end and a 35mm ID at the other end to connect a 1 1/2" OD tube to a 1 3/8" OD tube

38 3 1/4" 83mm 3

Black Silicone Coolant Bypass Cap, 1 1/8 inch ID 20721 Hand-crafted and quality inspected toThis cap features the same water and coolant compatible silicone rubber formulation as our silicone coolant hoses. It is designed for capping off coolant bypass or vacuum fittings, but it can also be used to protect fittings in storage. This size has a 28mm (1 1 8") ID, 36mm (1 7 16") OD and measures 38mm (1 1 2") Long overall with a 30mm depth. Maximum temperature 392 F (200 C). Operating pressure rating 28 psi. Black silicone rubber only. Sold