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A ridged flat fixture is ideal, aluminum or I use corian because I have it in stock. Use a compressible oring that will pull perfectly flat to the fixture with the vacuum on. If your oring stays...

Mike are you planning to vacuum 20-50 and run them in one run or is 20-50 at each run but 1 at a time? It makes a big difference what vacuum pump is appropriate.

I will put pictures up of a pump I will be selling tomorrow night.