Michael C Dunmore , WV March 23, 2020 Appliance: Model GSD2930548WA Slow drain, blocked drain was displaying on unit control panel on door of dishwasher and it kept shutting down I got online to see what might be wrong with my unit and then see what parts were recommended to repair the problem. I found this site and ordered two parts a piston and nut assembly and a check valve if the piston and nut did not fix my problem. Once I received my parts I installed the piston and nut assembly first and that was all I needed to make it drain prperly. It is working great and pumping the water up to the disposer drain with great flow now. I did not need to buy a whole new dishwasher. The present unit is a 90’s model I think. Still working fine and hopefully get a few more years out of it. Mike in WV. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes