3 Figure Display In Litres - Resettable 1" BSP Inlet/Outlet Max Work Presure 3.5 Bar Non-Flammable Disc Chamber-Can Be Used With Most Thin Viscosity Liquids Easy Calibration, 6 Digit Totalizer (Non-Resetable) Minimum Flow Rate 20 Ltr/Min Mounting holes: 103mm & 25mm