Does it have to go through the wall and onto the ground?
Is there any reason he can't have it discharge directly onto the garage floor?
Here in Winnipeg where most houses have their water heaters in their basements, it's not feasible to have the T&P relief valve discharge outside, so everyone just pipes them to within a few inches of the floor. Considering they rarely ever discharge, is it really necessary to pipe it through a concrete block wall?
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