| 摘要 |
<p>WATER METER SERVICE INSTALLATION A water meter service installation including both a water meter and a backflow protection device, both utilizing the same water meter box. The present installation can be retrofitted to existing meter boxes in the field as an elongated tubular extension is detachably connected to the water meter box in alignment with an opening therein, the extension extending therefrom and being capable of housing a cartridge insert member telescopingly positioned therein, the cartridge insert member having a pair of check valves in series to prevent backflow of water through the meter. By utilizing the tubular extension bolted to the exterior of the meter box, very little, if any area is taken up within the meter box and, thus, an existing meter box can still accommodate the conventional water meter while being provided with a backflow protection device in the form of a double valve cartridge insert.</p> |
