add 1 to p/n when output shafts are required on both ends add 2 to p/n when output shaft is required on "K"end only add 3 to p/n when output shaft is required on "D"end only ENERGIZED - output shaft coupled to input flange "D" end, input flange "K" end free. DE-ENERGIZED - output shaft coupled to input flange "K" end, input flange "D" end free.