A valve is an item that stops, restricts or allows the flow of water to a system.   Most valves (but not all) can also be used with air, other liquids and other gases.   Valves can be manually operated such as a garden tap, fully automatic such as a brass check or one-way valve or, mechanically operated such as a stock trough float valve.   We have a huge range of excellent quality valves available for practically any task.   If you are unsure of the correct valve for your application, please call or email for advice.