Heater Base Spacer Ring/Gasket (thru '74)

These round washers are used to make sure your heater outlet lines up properly. You can use more than one to make sure that when screwed into the base, the outlet of the heater valve properly aligns with the heater hose. It's a fiber washer that goes between the base and the heater valve. At least one is required in every installation, sometimes more.