Abstract: An improved drive post and dog arrangement for transferring the motion of the piston in an oscillating piston meter from the piston to the exterior of the measuring chamber whereby the noise produced by repeated disengagement and re-engagement of the drive post and dog is reduced.

Abstract: A water meter is provided with a retaining ring which is mounted on the top wall of the main case and secured thereto by means of a connection requiring limited rotary motion for engagement. A bonnet within which the register housing is enclosed is mounted on the retaining ring by a similar rotary motion whereby removal of either the bonnet from the retaining ring or the retaining ring from the main case requires only limited rotary motion in the reverse direction. To prevent removal of the register by unauthorized individuals such reverse rotary motion is prevented by a locking pin which projects through the bonnet, the retaining ring and into a recess in the main case whereby relative rotary motion between the bonnet and the retaining ring and the retaining ring and the main case is prevented. Once in place the pin cannot be removed without visible deformation or destruction thereof.

Abstract: A tamperproof, moisture proof data readout enclosure is comprised of a base plate adapted to be secured to a support structure and has channels formed in its rear surface. A cover adapted to be secured to the base plate has a sealing lip in its interior which cooperates with a seal on the base plate to provide a chamber within the enclosure which is sealed from the exterior environment when the cover is mounted on the base. The cover also has a peripherally extending wall which extends rearwardly from the front surface of the base plate and overlies the ends of the channels when the cover is secured in position. Openings are provided in the wall which register with the ends of the channels and locking pins are provided which project through the openings and the channels to prevent the removal of the cover from the base. Holes are provided on the locking pins to accommodate wires, the ends of which are sealed together to prevent removal of the locking pins without destruction of the integrity of the seal.

Abstract: A water meter has a register cover which performs the dual function of covering the register as well as providing a tool to enable disassembly of the meter.

Abstract: A water meter is disclosed in which the main case is of plastic material and is particularly structured for ease of molding with relatively simple molds in that no undercuts are formed on the main case which would require complicated molds and molding practices.

Abstract: A backflow prevention assembly designed for connection between a main supply line and a service pipe in water supply service, comprising two check valves in series and a relief valve for draining the chamber between the two check valves under certain operating conditions.

Abstract: A backflow prevention assembly designed for connection between a main supply line and a service pipe in water supply service, comprising two check valves in series and a relief valve for draining the chamber between the two check valves under certain operating conditions.

Abstract: A backflow prevention assembly designed for connection between a main supply line and a service pipe in water supply service, comprising two check valves in series and a relief valve for draining the chamber between the two check valves under certain operating conditions.