This is BABSL10FX2 High Pressure Seal R902601823 75-120-7 for Hydraulic Pump Motor , mainly used in rexroth Hydraulic pump A4VG250, those pumps usually are usred in roader roller, land scraper, shovel loader, self-discharging car, mixer truck and excavators etc. 
 
Medium pressure seals, such as the BABSL, can be used in many applications including pumps and motors in hydro-units, mechanical power transmission gearboxes, and 2-stroke engines. However in conventional seal designs, as pressure increases the seal life dramatically decreases due to atypical seal wear that is caused by pressure distortion of the seal lip geometry and increased friction at the contact point. The BABSL minimizes those problems over a wide range of operating conditions.
 
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