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I hope this is in the correct location... So I am working on an autonomous submarine for a senior capstone project at school. Basically, I made a large pressure vessel that houses our computer systems as well as our pneumatics system. It is an acrylic tube that is glued to two aluminum flanges...

Thanks for the help, stretching them worked great. The next size up is 1/4" bigger, so I don't think that would work. Thanks again! -g

So I am making a pressure vessel for aquatic use, and am having some problems with O ring face seal assembly. My O rings are size 171 and 174 (8.25 & 8.75 diameter at 3/32) and the grooves are machined within specified tolerances from this chart at the liquid specifications. The problem I am...