Clamps work and I put 1/2" PVC pipe in. They seem smaller than they should be, around 1/2" PVC pipe slightly to be able to introduce. I tried inserting the tubes from the side but they wouldn't go in. The next thing I tried worked. I slipped the PVC pipe in from the hole instead of from the side. I would not recommend it without warning. I won't be moving pipes often, so it won't affect me much. As they do their work, the pipes are filled with water. I am ok with the product.
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