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The original brass engine block drain valve on my TR4A is leaking again. I've tried over the years to "rebuild" it, with varying degrees of success, but I'm ready to give up and install a plug. I could plug the valve internally, but I don't want some PFO (Potential Future Owner) cursing me. I didn't have time to drain the system and remove the valve, so I'm wondering if anyone knows offhand what thread size is.
TIA
TIA