Just reamed out my original 3 inch sewer drain and added the valterra spigot third valve. Now with a 90 attached I can close the bay door with slinky attached.
Used the Reem PPR300 3" pipe reamer to clean out the hub. Worked very well.
I'm willing to loan this out if you pay shipping or sell it for a reasonable price. It's a one time use tool and Lord knows I have enough of those.
Package says warranty good for 1000 reams.
I meet a I guy that wished he had that tool. On some Realm's the pipe sticks out bottom of coach. He had driven over some RR tracks and broke fitting off.