flex couplings, r & d coupling, flex shaft couplings, shaft coupler, flexible shaft coupling, r & d flexible coupling, flexible shaft couplings, flexible couplings, drive shaft coupling http://www.getaprop.com/content-categories/cat-1000_1010_1002/bukh.html Sat, 26 May 2012 13:51:58 -0500 en 3.54" BUKH... The R & D Flexible Coupling fits between the transmission output flange and shaft coupling. It is designed to protect a boat's drivetrain. The unit will reduce vibration, compensate for some misalignment, isolate the shaft and absorb shock loads. Capacity: HP/RPM=3 (HP x GearRatio x 100/Max Rated RPM) Flange Diameter:3.54" # Holes:4 Hole Diameter:0.32" Bolt Circle:2.93" Pilot Diameter:1.85" http://www.getaprop.com/content-product_info/product_id-2028/r_d_flex_coupling_910_013.html http://www.getaprop.com/images/products/flexshaftcoupling[1].jpg http://www.getaprop.com/content-product_info/product_id-2028/r_d_flex_coupling_910_013.html