AprilAire 5879 Dehumidifier Risers improve drainage, ensure secure, level installations, and reduce vibration and noise. The risers provide 6 inches of added height and are compatible with all AprilAire Dehumidifier models such as the 1800 Series and E-Series. A must-have for optimal drainage when installing condensate pumps. The risers can support dehumidifiers with either leveling feet or casters. Risers should be placed on the ground, lining up with the feet or casters of the dehumidifier. Ensure that the dehumidifier is level for proper draining. Maximum uniform load is 2000 pounds (909 kg). Maximum point load is 560 pounds (254.5 kg). Made of durable injection molded polypropylene. Package includes four (4) risers.