Abstract: Tamper proof service bolts for sealing boxcars, automobile hoods, gates and other enclosures, as well as gas and electric meters, railroad switches and the like. In a first preferred embodiment the tamper proof service bolts are characterized by special head service bolts, each having a base member and a collar secured to the base member by means of a connecting bolt having a specialized head recess for receiving a corresponding tool which is required for removing the connecting bolt and the collar from the base member. In another preferred embodiment of the invention retainer clip service bolts are provided, wherein a retainer clip is adapted to mount on each base member and in the collar when the collar is fitted over the base member, to secure the collar on the base member.

Abstract: A gas service tee designed to facilitate tamper-proof termination of gas service to a residential or business location and/or removal of the gas meter without interruption of gas service. The gas service tee is characterized in a first preferred embodiment by a tee fitting located in the gas service line downstream from the gas meter and an adaptor having a tamper-proof adaptor stem mounted in the tee fitting, which adaptor stem can be adjusted to stop the flow of gas through the line. In a second preferred embodiment of the invention the adaptor stem is hollow and is provided with spaced stem openings and a stem grip may be provided for threadably rotating the stem inside an adaptor fitting located in the tee fitting. A tube fitting may also be provided on the stem or stem grip for receiving the hose of an auxiliary gas supply bottle and supplying gas to the residential or business location while the gas meter is being repaired or replaced.

Abstract: A tamper-proof valve which includes a valve body fitted with a transverse bore, an entry port and outlet port communicating with the transverse bore and an inner body seat for receiving a tapered inner body having a notch adapted for manipulation in alignment with the entry port and outlet port in open configuration and transverse to the entry port and outlet port, in closed configuration. A plug is provided on the top of the inner body for seating one end of a spring which is slidably encased in a collet. A square key is also slidably disposed in one end of the collet and is adapted to seat in a key seat provided in a top valve assembly which mounts on the valve body.

Abstract: An expansion plug element for insertion in the inlet line of a gas meter for blocking the flow of gas to the meter and a tool for inserting the expansion plug in the inlet leg of the gas service line and removing the expansion plug from the inlet leg. The expansion plug is characterized by a carriage bolt fitted with a pair of washers spanning a flexible washer and provided with a nut for tightening the washers against the flexible washer and wedging the expansion plug in the inlet leg. The tool element further includes a tool sleeve having a nut slot in one end for engaging the nut on the carriage bolt and an internally-threaded, thread-engaging end for engaging the threads on the carriage bolt and removing the expansion plug from the inlet leg of the gas service line.