The Rapco Inc. FAA-PMA approved RAregulator is a direct replacement for the Airborne Models 2H3-2, 133A3 and supersedes the AA2H3-2. The RA2H3-2 has a 5/8-inch hose fitting on the instrument side and a 5/8-inch threaded firewall fitting on the pump side. Older regulators that have seen more than 10 years service life are generally in need of replacement. Rapco Inc. regulators come preset to 5.0 HG in inches of Mercury (Hg) and are tested for consistant pressure output at various pressure inputs. The regulators are in stock and ready to ship. For more information visit www.rapcoinc.com.