Positive displacement (PD) meters are time tested and proven across the world. They are extremely dependable mechanical meters with known results and a metrology that makes over registration an impossibility. PD meters are much less sensitivity to temperature, pressure, and installation conditions than non-mechanical meters. 

RG3 patented Perpetual Meters are unique in that the dependable positive displacement measuring chamber is held in place with uniform compression provided by a 360° retaining ring. Uniform loading compression reduces wear spots in the chamber typically caused by bolts transferring force to the chamber in other PD meters.  Instead of a flat gasket, the bottom plate is sealed with an O-ring to prevent leakage, much like a hydraulic cylinder.   

Additionally, the chamber is nested in chloramine resistant 100% silicone that cradles the measuring element and adds additional protection against wear patterns developing. The outlet gasket is oversized to provide superior sealing to reduce low flow bypass. These patented provisions allow Perpetual Meters to retain new meter accuracy longer than traditional meters and are easily serviceable.

RG3 positive displacement meters come with a variety of bottom plate and register options.