The AE 41 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 NBR are used in hydraulics and pneumatics. They are well suited for piston rods with high stroke speeds. AE 41 standard dimensions have pads on the inner diameter which support the correct functional fit. Due to the additional diameter step on the outer fit, the AE 41 provides better sealing and exerts a stronger wiping force on the rod.