cold water

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Across
  1. 3. used in wc and storage cisterns
  2. 4. used to make fitting water tight when heated
  3. 6. an alloy used in the plumbing trade
  4. 8. allows water to only flow one way
Down
  1. 1. incoming main shut off valve
  2. 2. what colour off solder bobbin is suitable for potable water
  3. 5. at the lowest point on any water system
  4. 7. used to collect rainwater from roof