Kulthorn compressor kb series kb2425zk2, 1/2 hp, 208/230v, 1 phase, r404a/r507, lbp the kb series range from 3/203/8 hp. They are small sized, lightweight, and have a low noise output. They are compatible with the following refrigerants: r134a, r600a, r404a, and r290. These compressors can be used for household and commercial refrigerators, water coolers, icemakers, and vending machines.