Stuck sewer pipe adapter

[NYSUPstater]

What do others do to lesson the adapter that screws into CG pipe fittings? Yesterday I had 2 that got stuck and only way I got them out was w/ a screw driver and hammer. Do not recall this ever happening before, but really don't want to go thru that again. Soap up the threads 1st?

 

[wdk450]

I've seen many campground sewer openings with pretty rusted, "crudded" up metal threads. All I can suggest is some preventative metal pipe thread cleaning with a stiff wire brush (maybe on a drill?). The rusty threads fall apart, too. This falls on the campground maintenance. I think they make a short male-female adapter that would provide good threads again without massive plumbing repairs

 

[LBR]

I always keep a squirt bottle of water in my passthru for all kinds of small cleanup chores. I have had good luck useing it to wet the female threads, clean the crud with an old toothbrush, then bottle again to flush them out.