This comes with 1-3 3/8” copper lid punched for 1/2” tube. The hole size is 1/2” in diameter. Also 1-silicone wide mouth mason jar seal and 1-stainless steel wide mouth ring.
These rings are all fit tested before shipping.
FYI: Pipe fits extremely tight and the copper lid needs to be supported when fitting pipe. This is for 1/2" OD copper tube. (NOT 1/2" copper pipe which measures 5/8 OD)