progressive

  1. Scuba Doobie Do

    Two-stage progressive purge?

    In my quest for regulator knowledge I stumbled upon the two-stage progressive purge feature. I'm curious what the purpose of this feature is? This is from Apeks' website: "The XTX purge buttons are large and easy to operate. A 2-stage progressive purge is used. Press the purge on the side...
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