Industrial KWIK-D-TACH 1-3/8 in. 6S Female PTO to 1-3/8 in. 21S Male PTO Adapter connects a 6-spline female PTO to a 21-spline male PTO on a 1-3/8 in. shaft. It enables mating between PTO components that use 6S female and 21S male splines of the same shaft size.
