GPS slip yoke plugs seal up tail housing of popular dirt track transmissions that use a slip yoke. These plugs fit transmissions that use a 1.5" OD slip yoke in the output shaft housing. Plug seals tight to keep oil in and dirt out of transmission. Caps are simple to use and handy for transporting, storing and protecting Bert, Brinn, Winters maverick falcon and power glide transmissions. Another low cost solution that can save your team big money!