Step 1: Remove pressure union by unscrewing it counter-clockwise.
Step 2: Remove the flow control valve (this is located inside the pump housing - below the pressure union).
Step 3: Install the 800 psi Saginaw Pressure Reducing Valve in place of the flow control valve. Be very careful when putting in the Pressure Reducer, using pliers may damage it. Use your bare hand instead.
Step 4: Install the Pressure Union back on to the Pump.