2 biz if you don't mind me asking, how did you make the caps that cover the PVC?More options for you! I did my outside truck bay using this method...The cap I made just snaps into place. In the attic, I cut a 1.5"-2" wide strip down the entire length of the 5" pipe. Right through the connections. Makes for easy install of any tubing or replacing anything in the trough. To insulate, I cut 8' long strips of 4" insulation and stuff it in the pipe to seal it up. No freeze ups since making the change. When I bought the wash, the pipe was solid with only openings above each bay! No insulation...PO complained of freezing up every winter...For the life of me I don't know why the PO's put up with that! Pulling new lines down the entire length of pipe must have been exhausting too!
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It looks to me like the thin wall 4" sewer pipe.Is it just regular PVC? What size? It looks very thin.