The Muncie Power Products Back Up Ring, part number 90V-2681-426 or 90V2681426, is a genuine OEM sealing component for Muncie PTO units. Back up rings work in conjunction with primary seals to prevent extrusion and maintain sealing integrity under pressure cycling in power takeoff applications. As a Muncie Power Products part, this ring carries the correct material and dimensional profile for the application it was designed to serve. Pro Gear and Transmission supplies genuine Muncie PTO parts for fleet and shop needs. Call us to confirm this is the correct part for your unit before ordering.FeaturesGenuine Muncie Power Products OEM partPart numbers: 90V-2681-426 or 90V2681426Back up ring designed for Muncie PTO sealing systemsWorks with primary seals to resist extrusion under pressure cyclingSold by Pro Gear and Transmission