The main body of the shell is a simple MDPE pipe stiffener available from any good trade-plumbing outlet. The ones pictured below are used for common blue 25mm MDPE water pipe. The stiffener (from here on referred to as the shell) is 20.3mm in diameter. The shells inside diameter is 17mm. Pipe stiffeners do vary slightly in dimension from maker to maker so the manufacturing techniques illustrated here are based on the pipe stiffeners I used in the writing of this document. Any 25mm pipe stiffener may be used, but they may require slightly more trimming.
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