The threads on the plug are actually female threads
The threads are on the I.D. of the plugs and they go over the male threads on the return U bend. The return U bend on the P-trap part has male threads moulded inside of it
This is the inverse of what you would normally see for plugs
The plug is 1.520” wide and 0.670” long
This product can expose you to chemicals including titanium dioxide and carbon black which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov