Stop in for a cup of coffee

360DartGT66 said

I did find a 3/8" NPT nipple at Rock Auto:
More Information for DORMAN 56358

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Make sure it has the right diameter nipple. Look at your heater core and see if it has two 5/8" outlets, or one 5/8" and one 1/2".... I've seen them either way... Match what your car is so you don't need any reducers/adapters....