PTO Adaptor - Female Spline 1 3/4'' - 6 X Male Spline 1 3/8'' - 6 with Clamp Bolt. - Sparex Part S.151773Spenco PTO Adaptor Heavy Duty 1 3 4" Female Spline 6 x 1 3 8" Male Spline 6 This heavy duty PTO adaptor is designed for applications exceeding 70 horsepower. It features a 1 3 4" female spline with 6 splines and a 1 3 8" male spline with 6 splines. The adaptor is 7 7 8" long and increases the length by 5". It connects using a clamp bolt. Key Features: Brand: Spenco Connection Type: Clamp Bolt Duty: Heavy Horse Power: Over 70 Female spline (ins): 1 3 4