Radical 121
Radical 121 or radical jar meaning "jar" is one of the 29 Kangxi radicals composed of 6 strokes.
In the Kangxi Dictionary, there are 77 characters to be found under this radical.
缶 is also the 133rd indexing component in the Table of Indexing Chinese Character Components predominantly adopted by Simplified Chinese dictionaries published in mainland China.
In Japanese, 缶 is the shinjitai form of 罐, but the two characters are historically irrelevant.