Free - Twin Disc MG-5091 Troubleshooting Guide Parts for Twin Disc ® MG5091 Marine Transmissions - Coupling Section 1 Rubber coupling for Twin Disc marine transmission For housing number # 1, 14" (4 3/4", 12 1/4", 18 1/2"). Shallow case Price: $ 1,992.90 Qty: ^ Pictures In Stock Add to Cart 2 Rubber Block for Twin Disc Marine Gears . Price: $ 10.35 Qty: ^ Details In Stock Add to Cart 3 Allison and Twin Disc Coupling for marine gear . Price: $ 660.00 Qty: ^ Pictures Availability Out of stock Go Back Free - Twin Disc MG-5091 Troubleshooting Guide