Abstract: A case closed at one end by a cap and carrying on said cap, inside said case a hub having a stem threaded internally to receive an exhaust pipe from the exhaust port of a gas pressure regulator having an internal relief valve coupled to said exhaust port, the stem of the hub also having, proximate to its supporting cap, an exhaust orifice extending over a sector of the stem; the case having a venting orifice in the wall thereof, such venting orifice being azimuthally aligned with the exhaust orifice in the stem, results in an umbrella vent which permits, in combination with a slotted reading lid in a vault containing the operating umbrella vent according to this invention, the safe dissipation of excess gas pressure in a heating gas distribution system.