Once you have the cartridge in hand , you'll see a flat head screw holding the seal washer to the bottom , replacing the entire cartridge is only required if you have a leak up the shaft under the tap handle, or other problems that replacing the seal won't fix.
As Bob says , hardware stores have the parts , they are not RV exclusive items.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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