SMACO Mini Scuba Tank Pony Bottle Air Pressure Gauge 1pcs

Up to 300 Bar / 4,500 PSI

(ps: When you are filling the cylinder it is best not to exceed 200 Bar/3000Psi)

S300/S300Plus/S500: M10 x 1MM
S400/S400Plus/S400Pro/S700: 7/16" connect to first stage port

Small and compact,Visual low air indicator
Attaches directly to your regulator 1st stage