NAPA TRUCK ADAPTER KIT BK 700-1301 NOS Additional Contents: (2) Adapters Product Feature: Fits All Popular Trucks w/ Larger Dia. (2 11/16" O.d. B Size) Filter NecksWasherFits All Popular Trucks W/ Larger Dia. (2-11/16" O.d. B Size) Filter Necks Product Features: Adapter For Cooling System & Cap Pressure Tester (700-3025)Adapter For Cooling System And Cap Pressure Tester (700-3025) NOS E-230 #18