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Ha Ha...Little Edit. I just reviewed some pics I took when I put in the heater last year. The valves were already in my truck, and the hoses had been removed and the ends crimped over because the valves were obviously bad. There was already a 3/4" to 1/2" bushing in the lower port, so that's...

Now you guys are making me want to go check my installation to be sure. Both of my fittings were the same size...I believe 1/2". My heater works just fine and the truck get's up to temp just fine, so I don't think they are bypassing the t-stat line the article suggests. I'm almost 100% that...