penstock /penˈstok/

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

• packing-sheet
• pack it in
• pack it up
• pack-load
• pack-loads
• packman
• packmen
• packmule
• packmules
• pack or peel
• pack-rat
• pack-rats
• packs
• packsaddle
• packsaddles
• packsheet
• pack shot
• pack shots
• packstaff
• packstaffs
• packthread
• packthreads
• pack-train
• pack-trains
• pack-twine