Schrader 20004 TPMS Service Pack fits Buick Cadillac Chevrolet GMC Hummer Isuzu, single unit Schrader service packs include everything you need to properly service TPMS-equipped wheel and tire assemblies Electroless nickel-plated valve cores Each service packs is tailored to a specific vehicle make, model, and year Schrader OEM-quality components Replacement components in Schrader TPMS service packs are sensor specific Original-equipment specifications require that new grommets nuts valve cores and caps be installed every time a tire equipped with TPMS is removed and replaced on a wheel rim Schrader service packs include everything needed to properly service TPMS equipped tires and rims All service packs include nut grommet cap and core for applicable make and model. Service packs that are tailored to specific vehicle makes, models and years