SEALING RING FOR THE MASTER CYLINDER CAP ON 2.5 TON TRUCKS THAT HAVE AN APPROXIMATE 1-5/8" FILL HOLE ON THE MASTER CYLINDER.

IF YOU HAVE THE SMALLER MASTER CYLINDER CAP, SEE GASKET # 7373354  

IF YOU ARE INSTALLING A MASTER CYLINDER RESERVOIR KIT OR DOING DEEP WATER CROSSINGS IT IS VERY IMPORTANT TO HAVE THE CAP SEAL PROPERLY. 

NOT FOR M35A3 OR TRUCKS WITH UPGRADED DUAL CIRCUIT BRAKES. 

PART # FC6019 NSN 5330-00-291-6658, 5330002916658