Kevin M Clearwater , FL April 04, 2016 Appliance: Roper Washer RTW4340SQ0 Roper Washer Rtw4340sq0: Upper agitator stopped working. How to replace Liquid Fabric Softener Dispenser. Changed the agitator dogs and added a fabric softener dispenser. My Roper model RTW4340SQ0 wasn't listed as compatible with the dispenser, but I took a chance and it works like a charm! Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes