The Perfection Permalock mechanical tapping tee offers gas line installers a unique combination of speed, economy, and security when connecting a service line to a gas main. Permalock low profile tapping tees can be installed in as little as five minutes without the need for expensive heat fusion equipment. The simplicity of its installation procedure eliminates the need for extensive training and multiple-person crews. An like all tapping tees, Permalock tees can be installed without shutting down the main.