I just saw a piece on our local news last night about a couple of guys
who build homemade underwater ROVs. Most of the parts are PVC plumbing
fittings, available at the local hardware store.

I have some 1.25" Schedule 40 that is rated for 370 PSI. That's internal
pressure. It might be good for even more externally.

--
Paul Hovnanian
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Klein bottle for rent -- inquire within