The Uni-Valve (UniValve) is the most convenient way to control water usage in water fed pole applications. The Uni-Valve is a simple to operate way to start and stop the flow of water to your water fed pole. Simply fit the item to the inside of your hose and then pull the hose to start and stop the water flow. 
What it does — stop/start water flow to a water-fed pole by simply pulling the hose
Who it's for — window cleaners, irrigation users, professional cleaning operatives
Key benefits — saves water, reduces fatigue, no tools needed, fits inside hose