1/4"(6mm) to 1/4"(6mm) to 3/8"(10mm) pipe T-joint

1/4" Pipe to 3/8" Pipe T-joint

This t-joint has two quick-fitting sides for 1/4" piping, and one 3/8" on the "bottom" of the T-fitting. This fitting is normally used when you want to "T-off"  a 1/4" pipeline to another endpoint using 3/8" Size piping.