Free - Twin Disc MG-527 Troubleshooting Guide Twin Disc MG 527 Marine Transmission Parts - Transmission Seals Section Loading... 1 Front seal for Twin Disc marine gear MG521 and MG527 Input shaft seal Price: $ 46.61 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-527 Troubleshooting Guide