PTO Splined Coupling - Female Spline 1 3/4'' - 20 with - Sparex Part S.15733PTO Splined Coupling Female spline 1 3 4'' 20 with S. 15733 This Sparex Standard Duty PTO Splined Coupling is designed for applications up to 70HP. It features a 1 3 4" female spline with 20 splines and a length of 3 3 4" (95mm). The outside diameter is 2 23 64" (62. 25mm). Product Specifications Brand: Sparex Duty: Standard Female spline (ins): 1 3 4 Horse Power: up to 70 Length (ins): 3 3 4 Length (mm): 95 Number of female splines: 20 Outside