Powerbuilt 940376 Transmission Stop-Off Tool Transmission Stop Off Tool This tool fits most domestic rear wheel drive cars and light trucks, eliminating the draining of fluid when servicing the drive line or replacing universal joints 1.30-in thru 1.45-in diameter. No need to drain the transmission fluid when making repairs or replacing drive shaft U-joints The tool plugs the transmission drive shaft opening Reduces fluid waste and with a lot less mess