"This Liquidynamics digital electronic meter has 1-25 GPM flow range and 4-digit LCD display with resettable 4-digit floating decimal batch total. 300 PSI operating pressure. Poly construction display may be rotated in 90 increments uses 2 AA batteries included. 1in. NPT fittings. Operating PSI 300, Flow GPM 1-25, Outlet Port in. 1, Inlet Port in. 1."