Timothy J Bradenton , FL July 27, 2020 Appliance: Whirlpool Microwave Hood Combo WMH53521HB3 Whirlpool Microwave Wmh53521hb3: Inlet cover. How to replace Waveguide Cover. Ordered a new cover on Thursday, it was here on Friday. I snapped it in. Good to go. Great Service 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes