It is voluetric rotary piston water meter with NSF approval NSF Approval Volumetric Piston Brass Remote Reading Gallon Water Meter
Features · Mechanical transmission movement equates to maximum reliability. · The chamber of the rollers is liquid filled sealed for protecting the inner parts from the moisture and dust penetration. · Sealed wet dial register ,direct reading. · Plastic meter body and plastic ring. · Particularly suited in lower quality water.