It wasnt serviced correctly. Apeks breathe wonderfully, sorry you breathed a lemon. If you talk to people that have had regulator failures (free flows, burping, hard breathing, leaks, etc.) almost ALWAYS its immediately after servicing. This is another LDS pet peeve of mine -- LDS love to talk the life support equipment line to make sales but they rarely ever walk it with service. Theyll service a reg and throw it out the door with only minor testing.Rickoz once bubbled...
Roakey I use MK20s & D400s .
One day I used a mates ATX 200 that he just serviced infront of me (dive store owner).
I'll never buy them for a main reg set, like sucking through a straw compaired to my setup
After all, if theres a problem the customer will bring it back for a free fixup, right?
My Mk20s/G250s are on my stage/deco bottles along with my old DSTs/TX50s. One Mk20/G250 even has pretty green plastic that I use for pure O2.
Roak