Free - Twin Disc MG-506 Troubleshooting Guide Twin Disc MG 506 Marine Transmission Parts - Gasket Set Section Loading... 1 Twin Disc Gasket and seal kit for marine gear MG506 & MG506-1 . Price: $ 360.20 Qty: ^ Details In Stock Add to Cart 2 Rubber block for Twin Disc marine gears . Price: $ 7.26 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-506 Troubleshooting Guide