Copper tees are used to connect (3) copper pipes and can be used to branch off the main copper pipe with equal or smaller pipe sizes. The proper way to read a copper tee is Side x Side x Center (Top). For example, a 3/4" x 1/2" x 1" copper tee fitting is the same as 1/2" x 3/4" x 1".
These tee fittings are manufactured to meet or exceed ASTM and ANSI standards from high quality C12200 alloy used by leading copper fitting manufacturers such as Nibco and Mueller.
NSF certified for use in potable water applications and UPC listed.
Among plumbing professionals, it is common to use only (2) sizes for straight-through tees, such as 3/4" x 1/2". What this means is that the straight through run is all 3/4", while top (center branch) is 1/2" - which essentially is a 3/4" x 3/4" x 1/2" tee.