Sonnax piston retainer kit [12962N-01K] and oversized piston retainer kit 12962N-02K allows rebuilders to salvage the expensive reverse drum. The oversized piston retainer requires only turning the I.D. of the drum using a lathe and then installing as normal.

• Can be used in hydraulic or electonicly governed units
• O-Ring prevents loss of lube oil. Many OE supports do not seal well in this area
• Two O.D. oil delivery grooves have been repositioned at high-load areas
• Two I.D. oil delivery grooves run full length of load-bearing surface
• Band drum diameter (standard and oversized) allows drum I.D. to be turned
• High-quality aluminum resists gauling