Canadian Water Warehouse carries a versatile selection of John Guest shut-off valves in Polypropylene (PP) and Acetal to suit a variety of applications. PP Series valves are intended for potable water systems and should not be used with compressed air, explosive gases, petroleum-based fuels, or heating systems. Acetal shut-off valves are well suited to brewing, soft drink production, and drinking water applications. They can also be used with air and inert gases, including nitrogen (N₂) and carbon dioxide (CO₂), where appropriate.