gas line tube / nominal inlet gas pressure / gas supply / natural gas / gas pipe / car bon monoxide / Visible gas tubing / gas supplier / gas supply piping system / odorless and colorless gas / gas coal/log / gas tap / gas tight fit / gas tubing / vented gas coal/log sets / sure gas supply / fireplace gas coal/log set / gas appliance / gas coal/log set / gas line / inch gas pipe / /