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27.5mm(ID) x 1.2mm (cs)

@Wookie, I remember the "transplant job" that your wife wanted to be done with a SS Stinger and a titanium Spyder. Glad to hear that you are happy with the result.

@Kinglake, Now that you say it could perfectly be that I bought a wheel lug nut. I only remember I took a transmitter to HD and ask for any short blind cap that would have the same thread that the transmitter and walked out with a couple of bronze "caps" like the one I showed in the pictures.

@couv I am attaching three pictures of the cap. I bought it a long time ago and I am pretty sure it was at HD. However, it could have been also at the local Lowe's store.

@couv The right Oring size for AL i450T is 1,5mm x 40mm, the same size as for Oceanic OCi and OCS. Suunto D4 & D4i Oring size, on the other hand, is indeed 1,5mm x 39mm. Scuba Gaskets has it wrong.

@tursiops I'm a 70 ish retired electronic engineer and a SCUBA diver since the late 60's and I have been servicing and repairing dive computers and dive watches for the last 15 years. I have learned quite a few secrets of most dive computers as well as where to get tools and parts to service...

It doesn't. I incorporated the right size O ring myself to ensure sealing.

Agree that the applied pressure will not blow out the Delrin cap but when you pressurize the chamber it'll be subjected to 4 or 5 ATM external pressure that could open a hole in the Delrin if not thick enough. I'm not saying it will happen (not an expert on materials resistance). All I can say...

If you are closer to the UK than to the US, this is another alternative Watch parts and Tools store that carries the Bergeon 5555/10, as well as another using the same principle but more affordable (although smaller) waterproof tester, made also in Switzerland by Calypso: Search - waterproof testers

Sealing the transmitter with a 7/16" UNF female cap with an O ring.

I assume you are referring to the AI dive computers mounted in a console, with a hose connecting to a high-pressure port of the regulator (like the Suunto Cobra for instance). Those computers do not fit in the Bergeon pressure chamber and we use a pressure chamber similar to the Global for those...

Not at all. The handle is long enough to provide a powerful leverage to operate the internal manual pump. Ten to fifteen pump cycles and you are at 160 feet (50 meters), which is our standard testing depth.

We have tested thousands of dive computers (all brands and models) with the Bergeon waterproof tester and never have had an issue with the pressure sensors (remember you pressurize in the air for a very short interval of 1 to 2 minutes at most). There is a small offset in pressure depth...

@BoltSnap, We prefer the hand pump. Gives you better control of the increasing pressure ("depth") you are applying to the dive watch or computer under test. Although the Global pressure pot is much larger in size, the Bergeon allows conducting non-destructive tests whereas the Global doesn't...

I believe what you are looking for is the Bergeon 5555/10, transparent pressure chamber that can be pressurized to 330 feet. This is one of the pressure chambers we use at DIvewatchdoctor to pressure test every dive computer we service. It's not cheap but is the best your money can buy, swiss...

Shruber, You're right and we are aware of the behavior you describe. Is definitely true with the Suunto D4's and D6's. It happens sometimes with the D9's whereas never happens with the older Stinger and Spyder. Our non-destructive Bergeon testing chamber requires pressurizing first the dive...

GloryDayz is absolutely right on how to open the Mantis 2 to replace the battery. In spite of the misguiding suggestion in the Scubapro User Manual to use a "correct size coin" to open the rear case, you will not succeed and only ruin the case. The only secure way to open it, particularly if...

A good piece of information. Thanks, Barmo.

Bruce, User Manual was sent.

I have a PDF version of the CASIO DEP-510 User Manual. PM me your email.