This manufacturer-approved timer (part number WH12X10536) is for washers. Timer WH12X10536 controls the length of the different parts of the wash cycle such as filling, soaking, washing, spinning and rinsing. Un-plug the washer before installing this part. Wear work gloves to protect your hands. This Washer Timer part #WH12X10536 is guaranteed to fit your HOTPOINT WASHER #MTAP1000M1WW