The AE 42 is a single-acting wiper. Because it is pressed against the rod, dirt is wiped from the surface by the action of the rod as it retracts.
Wipers made of TPU are particularly well suited to applications in mobile hydraulics where they are subjected to a heavy dirt load. Due to the good wear resistance of polyurethane, the AE 42 has a particularly long service life. AE 42 standard dimensions have pads on the inner diameter which support the correct functional fit.