Dutch - 8/15/2013 3:06 PM
Some regs have a broader orifice wall where the reg meets the tank o-ring. With the advent of smaller o-rings, there began to be some problems. Then the DIN/yoke combi tank valves started showing up. The tolerance on those and the first stage is even less sometimes. It seems like the reg is seating on the oring but the insert is just too wide and does not allow for the proper seating. I started carrying my own insert that worked with my reg, after I modified it. I changed the fitting to a DIN as I am diving outside of the US these days and DIN is the standard.