plumbing cap under kitchen and bath sinks

Bobby A

Well-known member
Sorry I don't know the name of this part, I can only explain it and hope for some help. Under both kitchen and bath sinks there is black drain pipe, at the very end of this pipe is a cap of some sort ?? I was told these caps need to be cleaned or replaced periodically, can cause a smell in the coach. Can someone tell me what this part is called ?? and how do you clean it ??

Thank you,
Bobby A
 
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