The WDR Wiper is similar to WDD Wiper Seals, but in TRIATHANE®
(Poly-Urethane) material and also with diff erent groove dimensions,
mostly suggested to be used in conjunction with a back pumping
Primary Seal/Secondary Seal, like TRITILT® (RSS Style) Seal. The inner lip
holds the fi lm of oil within the system without being leaked out and the
outer lip shall prevent any dust particles entering the system.