Replace Alternate Part Number # bw-1219-86, 181986, 8181986, 8184369, 81843961. Will Fit In Coats tire changer models 20-20 AIR-FLATE, 20 20 AIR FLATE, 3030, 30 30A AIR FLATE 30-30A AIR FLATE, 4030, 40-30A, 40 30A, 4040A, 4040SA, 40 40A, 40-40A, 4050A, 40 50A, 40-50A.