Sonnax Zip Kit AW55-50SN-ZIP targets the root cause of multiple complaints by sealing the critical circuit pressure losses in Aisin AW 55-50/51SN valve bodies. The kit contains uniquely designed parts to prevent the loss of pressures within the main line, lockup, solenoid and throttle signal circuits. The kit also seals multiple circuits known to suffer from end plug leakage. No special tools are required for installing these parts. The Zip Kit quick guide provides clear and easy instructions on one sheet to get the unit sealed up and back on the road fast. In addition to general rebuilding tips and technical information, the technical booklet included in this kit contains vacuum testing information and locations at other key areas of the valve body. No reaming required Installs quickly with no special tools required Uniquely designed parts address root causes of valve body complaints by sealing critical pressure circuits Detailed technical booklet included with in-depth rebuild and inspection tips for comprehensive valve body repair Contents Pressure Regulator Valve, Balance Pin, Retaining Clip & O-Rings 2 O-Rings, 1 Extra O-Ringed End Plug Kit Solenoid Relay Valve Kit Solenoid Modulator Valve, Sleeve, Spacer Sleeve & Spring Boost Valve & Sleeve Lockup Relay Control Valve Kit B5 Control Spring LPC Accumulator Piston Kit Lockup Control Valve Kit Line Relief Spring Red Secondary Regulator Valve, Spring & Seals 2 Seals, 1 Extra B4 Release & Reverse Inhibit Springs (2) No Color Cooler Bypass Spring Large, No Color TCC Check Valve Springs (2) 1 Yellow, 1 White