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Stan >Can someone please comment on the advantages/disadvantages of sealed vs. >non-sealed first stages (as in the Apeks models)? I'm not sure I understand >the difference or if one has a higher potential for failure in certain >conditions. I don't plan on cold water diving at this point. The sealed version differs only in that it has a slightly longer first stage and what looks like a silicone environmental seal. In the event of the seal being damaged, water will ingress and you now have an unsealed first stage just like a US4. Thus, an environmental seal failure will not be a problem. To explain further. Inside the sealed compartment are the same innards as a US4 - A SS spring, screw thrust adjuster, pressure cap and diaphragm. It is the diaphragm that seals the remaining functional parts of the first stage innards from water. So if you lose the environmental seal the diaphragm provides a (second) water seal just like a US4. The environmental seal simply prevents water getting inside where the lack of water motion and well conducted cooling due to pressure drop could result in ice formation. I dive all year round in the UK with no problems when using sensible precautions. I have no experience in sub 4 deg C conditions so don't read anything into the suitability for this sort of diving. David Shimell shimell@se*.co* <mailto:shimell@se*.co*> DDI: 01932 814096 * Mobile: 07770 282 202 * Fax: 01932 814343 Project Manager, IBM UK Web Server Group, Sequent Computer Systems Ltd, Weybridge Business Park, Addlestone Road, Weybridge, Surrey, KT15 2UF, UK registered in England and Wales under company number: 1999363, registered office as above -----Original Message----- From: Stan Dilcher [SMTP:divewrecks@ho*.co*] Sent: Sunday, May 28, 2000 8:16 PM To: techdiver@aquanaut.com Subject: Thanks for Apeks Info! Thanks to the many people who have provided information in response to the Apeks regulator questions I posed. It looks like recommendations point to the the US4/TX40 combo. This will be for my first doubles rig that I am doing some advanced planning for. At present I am planning on a Scuba Pro R380 for a backup. My main diving interest is ocean/wreck diving. Can someone please comment on the advantages/disadvantages of sealed vs. non-sealed first stages (as in the Apeks models)? I'm not sure I understand the difference or if one has a higher potential for failure in certain conditions. I don't plan on cold water diving at this point. If anyone can provide any US dealer info with regards to a US4 DIN/TX40 combo I would appreciate it. Thanks again to everyone who responded, Stan Dilcher ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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