Diesel Pro carries the largest inventory of selective valves for all modela of Allison marine transmission MH. Allison marine transmission MH selector valve are shipped within 24 hours worldwide. We have selector valves for Allison marine transmission MH models MH15, MH15l, MH15r, MH20, MH20l, MH20r, MH30, MH30L, MH30R, MH35, MH35L, MH35R, MH40, MH40L, MH40R, MH45, MH45L, MH45R.