The 1-inch Button SPG designed for use with pony, Argon and bailout bottles when you need an indication of full or empty.
It screws directly into the standard high pressure 7/16-inch port of the regulator first stage and does not require a hose or spool.
It features a double scale display with increments of 50 BAR / 1000 PSI.
Cat. T.I. 130200.