Gold, Green, Red, Blue
I'm using this along with the ISTA face up CO2 cylinder. Together, they give a trouble free smooth flow of CO2. The pressure is reduced well by the regulator (no tube blow outs or pull outs), and the flow can be accurately controlled with the flow control knob. Easy to assemble and use.
it's the best regulator with solenoid! almost 1 year of experience.nbest part - doesn't heat up too much and is safe to handle.n