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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Sam and all..... I could not displace it at 500 psig, but could cause a slight leak by pulling and simultaneously twisting the gauge. When the gauge got to 50 psig, by twisting, pulling and pushing at 90 degrees to the gauge yolk's alignment, I was able to release enough to get the O-ring to displace and cause depressurization. I figure that using a 3x safety factor, it would be extremely difficult to happen above 150 psig. But it can happen with some pressure and enough force applied. Chances of this occurring during a normal dive are very low, and would include exiting on a boat and getting the SPG caught in a ladder, or something like that.
SeaRat
Hi All, I just recently acquired a R109 with a 1st stage which I assume is a mk5, but the notes of the seller said that it is a mk4, but there have been no mk4 manufactured. just want to be sure of this before reservicing the unit. View attachment 154557