Singer Pneumatic Motor Speed Transducer.
Part # : 988549-005
Alternate part number : 988549-003
For Singer models : 4600, 4610, 4613, 4617, 4623, 5910, 6233, 6234, 6235, 6267, 6268, 7000, 7004, 7005, 7029, 7033, 7034, 7035, 7043, 7050, 7060, 9000, 9100, 9110, 9113, 9117, 9124, 9130, 9133, 9134, 9137, 9143, 9210, 9217, 9224, 9240, 9323, 9334, 9400, 9408, 9410, 9416, 9417, 9420, 9423, 9430, 9432, 9444
To verify compatibility, please e-mail with make/model of your sewing machine.