This is HIGH PRESSURE SEAL, TCV 70*100*10 NBR used on hydraulic pumps . 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 Type TCV, for applications up to 50psi (3.5kg/cm2), is recommended. Pressure limit is dependent on shaft speed.Available for shaft diameters less than 2.500'' (65mm)
 
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