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1 barb is designed to have a curved hose attached to it and to the nipple on the thermostat housing, to provide a coolant bypass, while allowing an even warmup of the engine. The other barb is drilled, tapped and plugged with a 1/4" tapered pipe plug if no heater is being used. If a heater IS used, one of the heater hoses attach to it, with the other hose going to a 90 degree barb coming from the intake manifold. Water exits both barbs.
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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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