I thought this occurred very seldom, however, I have seen it happen twice this past summer. Once to me and then once to my dive buddy. My dive buddy's requlator was DIN so I was very suprised by that. I thought this almost never happens with DIN.
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Neither requlator was rental. Although, mine was a rental requlator that I purchased used. It has been serviced annually, though, and is not very old. It is also soaked overnight and cleaned after every dive. The LDS I purchased it from cycles through there rental gear every couple of years.captain:In 45 years I can't recall it ever happening to me. Where they rental or your own. Maintenance is the key.
mixdiver:I have had the yoke type go on me once. It was predive so no danger. The din valve is the way to go. The oring is captured.
ranger979:I know this is the conventional wisdom, but that doesn't appear to be the case from my very limited experience. As I mentioned, when it happened to me it was with the yoke type but when it happened to my dive buddy it was din.
When it happened to with the din valve it was initially a small leak. As I was investigating trying to find were the leak was coming from my dive buddy hit his inflator, at which time it became a major leak.