Camco's Covers for LP gas regulators is designed to protect the regulator’s vent opening from sleet, snow, freezing rain, ice, mud, and wheel spray. If any of these items are able to cover the vent or enter the vent the regulator could become inoperable. Protect your two stage regulator from the elements Fits Camco’s vertical vent, horizontal vent, and auto-changeover regulators Made of durable plastic Pack of 2