Separ Fuel Filter/Separator model 2000/10 with specific seals made fromHNBR (Hydrogenated Nitrile Butadiene Rubber), a durable material for fuel systems, often used in marine or diesel applications for its resistance to oil and fuel, and it's commonly sold as aseal kit (part #10528) or as part of the filter assembly, indicating high-performance, fuel-resistant gaskets for maintenance and service.
eBay