Port-A-Cool Evaporative Coolers offer effective, high-quality cooling in areas where heat is undesirable, and when traditional air conditioning is either impractical, unavailable, or cost prohibitive. The Port-A-Cool CASTER-KIT-02 is the caster kit for the Port-A-Cool 24 and 36 inch evaporative coolers, and contains four heavy-duty pneumatic casters that are used to improve the mobility of your Port-A-Cool unit on rough terrain.The CASTER-KIT-02 caster kit is compatible with the following 24 and 36 inch Port-A-Cool models: PAC2K363S, PAC2K361S, PAC2K36HPVS, PAC2K36AD, PAC2K36EP, PAC-MOB-01, PAC2K24HPVS, PAC2K24AD. Port-A-Cool® Evaporative Cooling Units are Manufactured by PORT-A-COOL, LLC., Center, Texas U.S.A.