John van der Pflum wrote:
Can some please give me a link to a decent needle valve or PH control
unit I can buy? My current CO2 system has the problem of end of tank
dump and it's starting to drive me crazy.

Thanks for the help.
I would recommend a clippard MNV-4k2. Widely used. the link below
tells about various needle valves available.

http://members.cox.net/tulsaalstons/...mendations.htm

Bob