This is an improved complete handle assembly, including handle, piston, valve spool, trigger, variable flow rate cylinder cap, etc., which is compatible with your AP front end fluid housing and fluid manifld. The handle is equipped with a variable flow rate cylinder cap. In the initial state, the flow rate is maximum. Rotate the knob to the right, the flow rate will decrease from high to low until it closes, and the piston can be locked. Spray the pattern and change accordingly. NOTE：This item is for sale as a complete handle assembly, excluding front end fluid housing and fluid manifld.