Available in 3/8 NPT and 1/2 NPT x #10 O-ring, these adapters allow #10 A/C refrigerant hose to be used as heater hose. Thread this adapter in your water pump or intake manifold and use our #10 Pure Stealth Reduced Barrier Fittings along with our #10 Pure Stealth Reduced Barrier A/C Hose to create a visually consistent look under your hood.

If you are using an LS engine with the stock water pump, simply pull the steel heater hose barbs out of your water pump, drill and tap the holes. The smaller port will be the pressure port and it should be tapped to 3/8 NPT. The larger port will be the return port and it should be tapped to 1/2 NPT. Install X15000 in the pressure port and X15010 in the return port.