Sonnax 4L60 4L60E 4L65-E & 4L70-E Pinless Accumulator Piston Kit Pinless design eliminates the possibility of pin bore leakage and the additional length stabilizes the piston to prevent piston cocking Dual seals stabilize and completely seal the bore and provide a tight seal even after thousands of cycles Pinless Accumulator Piston, Viton? D-Ring, PTFE Seal, Steel Balls (2)