Ford 5R55W 5R55S 5R55N Transmission Pump Flow Control Valve Assembly Kit Sonnax designed to increase pump efficiency by rerouting excess line pressure back to the suction side of the pump. Harder canister material resists wear and has improved valve support to prevent sticking Larger O-ring eliminates pressure loss at the pump face Canister restores the regulated line orifice to improve valve and hydraulic stability. Drop-in-place replacement assembly for easy installation.