Rated to 5000 psi in 1000 psi increments, our 1-inch Button SPG is ideal for use with pony, Argon and bailout bottles when all you need is an indication of full or empty. A color-coded scale helps ensure an accurate read. Fits standard, 7/16-inch high pressure port of any first stage regulator. No hose required. Chrome plated brass with a polycarbonate face resists corrosion and scratches.