The Tube-Crawler

Furthermore, clear PVC tubing greater than an inch and a half in diameter quickly doubles and triples in price, thus we chose to use clear acrylic tubing. Also, we found it very difficult to locate metric tube sizes, and even when found, 6- and 8-centimeter diameters were nowhere to be found. Thus, we decided on 3-inch and 4-inch clear acrylic tubing, which have inside diameters of 2.75” and ... ................
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