Free - Twin Disc MG-516 Troubleshooting Guide Twin Disc MG 516 Marine Transmission Parts - Seal Section Loading... 1 Front seal for Twin Disc marine gear MG516 & MG518 Input shaft seal Price: $ 84.62 Qty: ^ Pictures In Stock Add to Cart 2 Rear seal for Twin Disc marine gear. Output shaft seal Price: $ 167.63 Qty: ^ Pictures In Stock Add to Cart 3 Mechanical & Electric Gauges See Our Gauges Page 4 Controls Cables & More... See All Control, Cables & More 5 Marine Water Pumps See All Marine Water Pumps 6 Fresh Water Pumps See All Fresh Water Pumps Free - Twin Disc MG-516 Troubleshooting Guide