1 TRI-TEC HI VACUUM 2pc REAR MAIN SEAL. THIS IS A 2 pc REAR MAIN SEAL THAT IS USED BY THE TOP NASCAR ENGINE BUILDERS FOR HI VACUUM APPLICATION AND SUPERIOR SEALING. 1 NEW REAR MAIN SEAL. SEAL IS SPLIT WITH A V AND HAS A O-RING AROUND OUTSIDE TO CLOSE SEAL AND HOLD IN PLACE.
