Arch Hoagland said:https://www.walmart.com/ip/TheWorks-ZIP-IT-Drain-Cleaning-Tool-1-Pack-of-2/159845159?wmlspartner=wlpa&selectedSellerId=0&adid=22222222227161037142&wl0=&wl1=g&wl2=c&wl3=272245039839&wl4=pla-452479268123&wl5=9031807&wl6=&wl7=&wl8=&wl9=pla&wl10=8175035&wl11=online&wl12=159845159&wl13=&veh=sem&gclid=EAIaIQobChMIoqrv18-k3gIVl_hkCh0stgyyEAQYASABEgLH3fD_BwE
I'd suggest using this "Zip It" as your problem is more than likely hair in the drain.
ChasA said:My Winnebago has a HEPvO trap under the shower, mounted horizontally.