REPLACEMENT SOLENOID FOR YOUR M SERIES VEHICLE'S 24 VOLT AIR HORN. SOLENOID OPENS WHEN VOLTAGE IS APPLIED TO LET YOUR HORN OPERATE. FIRS M35A1, M35A2, M35A3, M54A2, M813, M809, M923, M939 AND MANY MORE MILITARY AIR HORN EQUIPPED VEHICLES .

OUTPUT PORT SIZE IS FOR 1/4" PIPE, AND THE INPUT PORT IS FOR 1/8" PIPE.

# MS17981-1 NSN 5945011700553 OTHER NUMBERS INCLUDE A-A-52525

WE ALSO HAVE THE COMPLETE AIR HORN ASSEMBLY IN OUR STORE, # MS51301-1, AND HORN BUTTON REPAIR KITS FOR M35A2 AND M54A2 # 5702506