The crossword clue "system of water and gas pipes" with 8 letters is best answered by the word "PLUMBING." Plumbing refers to the network of pipes, fixtures, and fittings used for water supply, gas delivery, and waste removal in buildings, making it a perfect fit for the clue.
For a related clue like "water or gas pipes" with 5 letters, the answer is often "MAINS," referring to large underground pipes for water or gas distribution.
