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Bill that is the one that would be attached from a heater core with another hose taking presurized coolant from the top of the intake manifold to the heater core too. Napa & Ford sell a small rubber cap or it can be internally threaded for 1/4" pipe and a tapered pipe plug used for a more secure fix.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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