Vent Limiter, Automatic, 1/2", Maxitrol For 1-1/4", 1-1/2" & 2" Maxitrol Regulators (each)

• Optional automatic vent limiting device - ball check permits unobstructed inhalation for fast regulator diaphragm response on opening cycle, but limits gas escapement to within ANSI standards should a diaphragm rupture.
• NOTE: When using the vent limiting device, regulator must be mounted in a horizontal upright position.