I have had them on my last 2 Jayco's and wouldn't be without one. I use a clear elbow between the connection on the RV and the "stinky slinky" - I drain and flush until it is clear, then turn off the flusher and close the valve. The sensors stay clear and all is well
They work great for me.
2012 Jayco 32TSBH
2004 Ford Excursion
ProPride 3P / Tru Control brake controller
Roadmaster Active Suspension