LS Water Pump to -20 AN Adapter KitEarl's leads the way with firsts for LS engines! Water pumps come with push on barbs for clamping the standard radiator hose. Push on hose connects just aren't good enough for the hard core performance minded. Earl's offers an adapter kit to convert inlet and outlet to 20 AN. One kits works with ALL LS water pumps. Included is an O ring adapter plate which upgrades early LS water pumps to the later, less restrictive style of thermostat.