Possible Clues:

• Don't crow any more - just shut it off
• How to tell the rooster to shut up and shut off
• Don't crow so much - turn it off!
• Leave off crowing; turn it off
• This regulates flow, given Spooner's police funds?
• Supply required outside, work on cold tap
• What can cut off supply of oxygen and copper in store
• Valve from ordinary computer where you would expect to find it if available?
• Check tilt - it will help to prevent leaks
• Valve and set of pipes next to bunk