I have one of those hydro flush adapters for my rv sewer, and I have to hard pipe my system now (seasonal site). My question...what size pipe do I need to fit into the bottom flange? The camper is a two hr drive away and I thought maybe someone on here could tell me. If not, I guess ill go to walmart and measure. Thanks in advance.

 

if your talking about the dump line on the camper where you hook up the sewer hose i believe it is 3"