There are two types of spring loaded hose shut offs. one works on time and the other on gallons. I have one of each and think the Gallon Model is the better choice. The gallon meter is popular for filling of topping off of swimming pools and go up to 1200 gallons and is marked as low as 100 gallons. You just screw them on to your hose or in our case I put mine on the Back Flow Preventer on my truck. I use a quick connect to hook my garden hose to it. Look in your local hardware store's Garden Hose and Garden Hose Nozzle Section. These are not hard to find and I am think I paid Less than $ 10. .