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Sugarmaker

One photo shows the yellow hollow core slipped onto 5/16 tubing, where about an 18" section of the hollow core is on the 5/16 tubing. The other photo shows the tubing being pulled tight with the hollow core in hand. I do this over a storage tank of either 30 or 50 gallons.

It works great because so long as the hollow core has a good grip on the tubing ( you have to work it through for about 18 inches ) you can pull the tubing as tight as you want. I do that by wrapping the hollow core around a tree and then pulling tight using the tree ( any tree ) as an anchor. You can wrap around the anchor tree a few times with the hollow core and then just do 4 or 5 wrap overs with the hollow core and it will stay tight.

Got to have the write sizes. Walmart sells two sizes of the yellow. One works great for 3/16 and the other works great for 5/16.

Not every Walmart carries the yellow hollow core.

Has to be hollow core.