This is BAFSL1SF SEAL 45*80*7/5 VITON High Pressure Shaft Oil Seal for hydraulic pump , such as REXROHT A4V(T)G71 , 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,