It is made from high-quality, chemical-resistant Viton rubber. (113073001). Includes New PPE Viton O-ring. PPE Heavy Duty Black Deep Transmission Pan For 20+ GM 2500HD/3500HD L5P 10L1000. PPE Transmission Line Pressure EPC Blocker For 11-19 Chevy/GMC 2500 3500 Allison.