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Mike Peters · 10-13-2020, 09:40 AM

1/8" NPT. Drain valve located on the bottom of the water return pipe on the driver side of your car. If you have some sort of after market radiator with a drain valve, then the thread size may be different.

10-13-2020, 09:40 AM	#2
Mike Peters Senior Member Join Date: Aug 2012 Location: South East Wisconsin Posts: 1,279	Re: Drain valve question 1/8" NPT. Drain valve located on the bottom of the water return pipe on the driver side of your car. If you have some sort of after market radiator with a drain valve, then the thread size may be different.