I just found out that the Uemis transmitter will not fit properly on the Apeks DS4/DST first stages: the flat area that sits flush against the port surface is too wide, causing it to catch on the round body of these regs before bottoming out flat against the port. This leaves a substantial gap, and means the o-ring is not properly seated. Solution would be to use a small HP hose... which isn't easy because the transmitter doesn't have the usual hole for a swivel.
Both were suggested to Uemis as possible product enhancements.
Both were suggested to Uemis as possible product enhancements.