Thor uses ABS pipe in their drain systems. ABS, commonly known as "all black stuff, but it is a styrene plastic. It is quite rigid and must less suitable to cracking under stress or freeze damage than PVC. It uses a special green solvent glue to attach the fittings to the pipe. There is no pipe prep required with ABS. No purple stuff required. It has a foam core so it is much quieter than PVC.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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