I don't remember where I bought the PVC drain fittings but it's pretty thin - about 1/16 inch - thicker than chrome plated brass but not by much. Of course, if there are multiple grades available go for the thickest. Mine is no where near the heat of the engine space but I made a point of preventing any stress from the hose being applied to the PVC pipe. Where the hose goes through a shelf I put in a plywood ring to take the side load of the very stiff hose.