Brass Compression Female Tee is used to connect three lengths of copper pipe to create a junction. Two ends are the same diameter with the third being a 1/2" female thread. It requires no special tools or soldering to install, just tighten with a spanner to create a joint by compressing the ring onto the tube. It can be used in hot or cold water applications as well as heating and low pressure gas installations. The joint can be made on wet pipe work.