Just a quick update: the CO2 cylinder, regulator and GLA 40mm in-tank diffuser are doing a very nice job of producing a lime-green drop checker indication. In a bit of luck the builtin needle valve on the Aquamedic is at it’s minimum setting and that is what is doing this level. Furthermore the 2bar indication on the output gauge appears to produce more than sufficient pressure for the diffuser to work. Good thing since the regulator has a fixed output.
Serendepity since this regulator was purchased in 2002.