Valterra 45 Degree Hydroflush Attachment with Removable Anti-Siphon Valve for RV, Camper, Trailer -F02-4100

Make sure this fits by entering your model number.
SEWER TANK RINSER: Breaks up plugged tanks and cleans tank, pipe, valve, drain hose
FUNCTIONAL: Internal backflow preventer and removable anti-siphon valve protect the fresh water supply from possible backflow

Amazon.com Price:  $21.14 (as of 10/01/2023 15:26 PST- Details)