So this joker "builds his own watch/dive computer waterproof-ness rigs" out of common in-line water traps for compressed air systems.
His instructions say to fill the polycarbonate bowl with watches, top them off with water, tighten down the lid and pressurize the chamber to 100PSI.
He builds these "custom" and can ship immediately.
To anyone who does not know, this is a great way to destroy your watches. It's the exact opposite of how you are supposed to test them.
http://www.ebay.com/itm/Dive-computer-watch-pressure-test-tank-simulates-depth-/121080803050?pt=LH_DefaultDomain_0&hash=item1c30fa6eea