The Harris model 25GX is the new and improved model 25 regulator. It now features 2-1/2" guages which are easier to read compared to the 2" guages and a knob handle instead of a T-handle for pressure adjustment. Best of all it now features a 7 year warranty versus the original 25 regulator's 3 year warranty. Medium duty, single stage, 0-15 PSI , CGA 510