I have a '93 RV that had to have the recovery tank removed (that's a whole story in itself). The original support straps were cut by someone in the past and they built a crappy (unintended pun) way to support the tank. When I reinstalled the tank, I wanted to use piping similar to what was originally installed by the manufacturer. RV sites don't tell you what to use or offer you anything for sale. I found this on AMAZON (aren't they great!) and it worked great. A full waste tank in my setup weighs about 300 pounds. No problem for this stuff!
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