I live in Florida and need to extend my exterior above ground natural gas line. The existing pipe is 3/4 inch galvanized with a Tee in the line with a plug in one end. I want to attach a 4 foot 3/4 inch pipe to the Tee so I can install a on off valve with fitting for a BBQ grill hookup. I need to know the approved way to attach the new pipe to the exterior wall. Thank you in advance for your help.