Free - Twin Disc MG-5090A Troubleshooting Guide Parts for Twin Disc ® MG5090A Marine Transmissions - Seal Section 1 Front seal for Twin Disc marine gear MG5090A and MG5111A . Price: $ 28.39 Qty: ^ Pictures In Stock Add to Cart 2 Twin Disc Rear seal for marine gear MG5090 and MG5091 . Price: $ 35.08 Qty: ^ Details In Stock Add to Cart Go Back Free - Twin Disc MG-5090A Troubleshooting Guide