penstock /penˈstok/

1. A sluice
2. (in a hydroelectric or other plant) a valve-controlled water conduit

• pilot balloon
• pilot balloons
• pilot-boat
• pilot-boats
• pilot burner
• pilot burners
• pilot cloth
• pilot cloths
• piloted
• pilot engine
• pilot engines
• pilot fish
• pilot flag
• pilot flags
• pilot house
• pilot houses
• piloting
• pilotis
• pilot jack
• pilot jacket
• pilot jackets
• pilot jet
• pilot jets
• pilot lamp
• pilot lamps