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**jocko** · 09-10-2016, 12:39 PM

cyl hd coolant drain pipe plug. comes in handy when removing a cyl head so you don't dump coolant into the cylinder upon removal when the mating surfaces separate.

09-10-2016, 12:39 PM	#7
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,994	Re: What are these and what for? cyl hd coolant drain pipe plug. comes in handy when removing a cyl head so you don't dump coolant into the cylinder upon removal when the mating surfaces separate.