PTO Adaptor - Female Spline 1'' - 18 X Male Spline 1 3/8'' - 6 with - Sparex Part S.15073PTO Adaptor Female spline 1'' 18 x Male spline 1 3 8'' 6 with S. 15073 This Standard Duty PTO Adaptor is designed for use with up to 70HP engines. It features a 1" female spline with 18 teeth and a 1 3 8" male spline with 6 teeth. The adaptor is 127mm (5") long and increases the length by 76mm (3"). Product Specifications Brand: Spenco Duty: Standard erp_hazardous: No Female spline (ins): 1 Horse Power: up to 70 Increases length (ins): 3 Increases