The Maxitrol 13A30-50 Vent Protector is an outdoor protective accessory designed for 325-3 Series gas pressure regulators with a 1/8-inch NPT vent connection. It attaches to the regulator vent opening and uses a protective housing and O-ring seal to help prevent rain, snow, dust, insects, and other debris from entering the vent. This component helps maintain proper regulator venting, ... https://www.partshnc.com/13a30-50-maxitrol-vent-protector-325-3-series