15143 82111: SEAL:OIL;XMSN Seals YM129902 21000 YM129902 21000 model: Heli old a and 3 PSI at 3000 FPM Temperature Range: Suitable for typical transmission operating temperatures Installation Requirements: Shaft Hardness: Recommended to be above Rockwell C 45 for optimal seal performance and longevity Shaft Finish: 10 20 micro inches for best sealing results Maximum Shaft Dynamic Runout (DRO): 0 Product Specifications: Part Name: Oil Seal for Transmission Part Number: 15143 82111 Type: Transmission Oil Seal Design and Function: Spring loaded design for better sealing performance Prevents oil leakage from the transmission and keeps contaminants out Material and Construction: Sealing Element: Likely made from a high performance elastomer compound such as Nitrile rubber (NBR) or Fluoroelastomer (FKM) Case: Typically metal encased for improved durability and ease of installation Performance Characteristics: Shaft Speed Capability: Up to 3000 feet per minute (FPM) Pressure Handling: Approximately 7 PSI at 1000 FPM