Possible Clues:

• Oxygenating tool
• Faucet part
• Kitchen faucet part
• A time with a hill will make it great gas
• One may get the wind up with this
• Lawn-keeper's implement dug up stretch of land on hill
• Aquarium apparatus
• Device introducing air
• Greenskeeper's gizmo
• To a rare concoction - it will give you gas!