Upon arrival, customer showed us to the side of the house where a gas regulator was to be installed for the pool heater. After visually inspecting the gas line, we found a tee servicing an unknown gas line off the branch- the customer is unaware of additional fixtures that the unknown line could service. Due to the upgraded gas meter, we recommended that this unknown line be capped. With customer’s approval, we turned off gas to the residence and disassembled a section of existing gas line containing the tee and capped the bottom line. We then installed a 3/4” gas regulator and new section of gas piping, turned gas back on to the home, and relit pilot lights. No further issues present at this time.