Not that brand which is supposed to be a "new" design (and higher priced). We had a Camco one on our 1974 Apache Pop-up. Worked great. We liked it so much that we will be installing them on our drains (galley sink, bathroom sink and shower drain) in the skoolie. The "bell" shaped thing is the p-trap. The rest is just a plastic bilge pump type hose and a "thru-the-wall" fitting to attach a water hose to drain the waste water out.
$8.81 Camco vs. $26.70 Hepvo ...... I'm also frugal!