Choose the size you need!
These tees are stainless steel and come in two sizes:
One works great for connecting either 3/16" or 1/4" beer lines (when connecting 3/16" heat line in hot water for 20 seconds)
and the other works great for connecting either 5/16" or 3/8" beer lines
(if you have any problems when connecting, heat line in hot water for 20 seconds).