Are you talking about the 5 or 6 inch sewer hose screw down cap? On all my previous coaches and the current one, the access cap for the power cord is a hinged cap and not screw down. If you search for sewer hose screw down access cover you might have better luck.
Unless you know the manufacturer of the current access, you might have to buy the whole access cover because the Camco and Valterra covers are not compatible as far as threads. That is what I had to do to replace a broken one on the Challenger a few years ago.
https://www.etrailer.com/RV-Sewer/Va...10-2171VP.html
https://www.rvupgradestore.com/RV-Ha...ocks-s/281.htm
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