Questions about: shutoff

While prepping to install a new kitchen faucet, I went to shut off the water supply to the house since there were no valves under the sink. I mistakenly chose to turn the city-side (gate valve) supply off instead of the home-side (ball valve). When I
First, Mike connects the gas shutoff valve and sediment trap -- that's the short section of pipe running downward, then attaches the corrugated stainless steel supply line. Jim now makes the last few connections between the water shutoff valves and t