This Lid Latch Assembly (Part Number W10404050) Is An Official Replacement Part For Your Whirlpool Washer. The Point Of The Lid Switch Is For The Tub To Stop Spinning When The Washer Lid Is Opened. It Is A Safety Precaution Just In Case Someone Decides To Stick Their Hand Inside The Washer While The Tub Is Spinning. Same Day Shipping On All Orders Placed Before 4 PM Eastern Time.