5,000 PSI Liquid Filled Pressure Gauge, includes adapter to screw in to High Pressure Port on Meyer E-47, E-57, E-58H, and E-60 pumps. Also fits H Models. Adapter will not fit older E-47 units with 5/8" Drain Plugs. It can still be used on them, but must be installed "inline". This Gauge comes exactly as pictured. It requires a Coupler Set to install it inline on an Angle Hose to check pump pressure, or to set Crossover Relief Valve Pressure. COUPLERS SOLD SEPARATELY. Does not include coupler set as you will need to use the type you have on the system you are testing; ie: "Ball Type" or "Pin Type" or "Low Spill" etc. Couplers. All included fittings rated at 5,000psi or higher.