I think Chris is right. Most tubs have a method of insulating the bulk water to stay warm, but have service area without insulation to get at pumps and such that need to be heated to prevent freezing. In my tub when the heater stops working the tub will go into survival mode and use the hot water in the tub to prevent the pumps from freezing by slowly moving water around. I dont know for sure how this tub works, where it is located or what kind of tub it is. The OP hasnt given a lot of information.
My guess is it is for heating something.
Well done.:thbup:It is called a Hartford loop and I guess it equalizes pressures for your jets. You can Google it for more info.
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