The Apeks HP twin adaptor allows you to use both a submersible pressure gauge and a transmitter from a first stage that only has a single high pressure port. 

The twin adaptor also has the added benefit of allowing the transmitter to rotate 360 degrees, which prevents the transmitter being damaged if a cylinder was to fall over.

The Apeks HP twin adaptor utilises a standard 7/16” thread and is suitable for use on all manufacturers first stages.