Homeowner has a gas line they need moved for their stove. I removed the black iron pipe coming out of the wall, and replaced it with a shorter piece of pipe. Installed a new black iron 90° and a new gas shutoff valve. I repressurized the gas system, and checked everything for leaks with gas leak detector spray. I ran the new stove to ensure it worked. Homeowner has a water heater from 2007 with no expansion tank. I recommended it or at least adding a thermal expansion tank. Homeowner declined at this time. I relit the water heater before I left, but do to the age of the heater, I advised the homeowner that it could fail at any moment.