Genuine Detroit Diesel NOS parts are increasingly desirable for owners, mechanics, yards, and rebuilders keeping proven marine and industrial diesel engines in service. This listing is for a Detroit Diesel genuine OEM mechanical seal kit, part number 05P0313X, also searched as 05PO313X due to common zero/letter-O confusion in older part labels. Detroit Genuine Parts are valued because they are made for the correct engine application rather than being generic “make it fit” replacements, and this is the kind of original service part that can be difficult to source once older dealer inventory dries up.Item specifics: Brand Detroit Diesel; part number / MPN 05P0313X / 05PO313X; type mechanical seal kit; category diesel engine parts / marine diesel repair parts; condition new old stock, unused. Known kit contents from the exact retail reference include seal assembly, spring, sealing ring, and washer. Material details listed for the kit include steel, ceramic, and composite components, with silver/white finish elements. Size is listed as standard OEM.Condition: NOS unused part in original Detroit Diesel packaging. Packaging may show shelf wear from storage, handling, or age, but the part is being sold as new old stock. Please compare the part number and photos to your service manual, old part, or Detroit Diesel parts book before purchase, as final fitment is the buyer’s responsibility.This OEM Detroit Diesel mechanical seal kit is well suited for marine diesel, industrial diesel, generator, workboat, commercial vessel, and engine repair inventory where authentic Detroit Diesel parts matter. Scarcity, current supply pressure, and rising replacement-parts costs make NOS OEM seal kits more valuable than ordinary aftermarket substitutes.#MarineParts #DetroitDiesel #MechanicalSeal #NOS #BoatParts