NEW OLD STOCK DUAL CIRCUIT MASTER CYLINDER FOR M35A2 MODELS THAT HAD RECEIVED A DUAL CIRCUIT UPGRADE. THIS WAS COMMON FOR, BUT NOT LIMITED TO,  AIR FORCE TRUCKS ISSUED IN THE LATE 1980S. 

VERY HARD TO FIND PART, AND NOT MANY AVAILABLE AT THE TIME OF LISTING. 

O RING KITS ALSO AVAILABLE IF YOUR CURRENT MASTER CYLINDER HAS AN INTERNAL BORE IN GOOD CONDITION WITH NO SCORING. SEE PART #DCMCKIT175. 

PART # 12357047 NSN 2530-01-257-7643, 2530012577643