AUTOMATIC VENT LIMITING DEVICE.;FOR MAXITROL REGULATORS RV48, RV52, RV53, RV61;EXCEPT WITH SUFFIX "L" WHICH HAS INTERGRAL VENT LIMITER.;MAINLY USED IN INDOOR APPLICATIONS TO LIMIT THE AMOUNT OF;ESCAPED GAS IN THE EVENT OF A DIAPHRAM FAILUE. Replaces Randell HD GAS801.
