Black Silicone Coolant Bypass Cap, 20mm ID Inch_2 It will handle an air-fuel

It will handle an air-fuel mixture and will survive occasional spills and oil leaks

On top of all that

75 and 3613-1

5 Inch 4 Inch 4

Pre-molded 45 degree elbow

Black Silicone Coolant Bypass Cap, 20mm ID Inch_2 It will handle an air-fuelThis 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 20mm (13 16") ID, 28mm (1 1 8") OD and measures 38mm (1 1 2") Long overall with a 30mm depth. Maximum temperature 392 F (200 C). Operating pressure rating 42 psi. Black silicone rubber only. Sold