The cleaner isn’t super strong, but after I got to the store and started getting some 2 inch fittings I decided to go with 3 inches. I think 2 inches probably would have been ok, but on the off chance that it wasn’t I didn’t want to do it again with 3 inch pipe.
I built the pipe structure and filled it with the better part of a 50lb bag of sand and put it in place.
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It seems pretty well planted in place, but I’ll give it a few days and see how it does. If the cleaner does manage to move it then I’ll try to figure out some way to attach it to the steps. I think I’m gonna be ok though.