Plast-O-Matic Valves” all-purpose PTFE bellows solenoid valve eliminates leaking of fugitive emissions to the atmosphere. Designed for environmental safety, these thermoplastic valves can also be used with virtually all types of fluids, including acids, caustics, solvents, and chlorine solutions, as well as ultra-pure liquids. The major distinguishing feature of the valve is a PTFE bellows, barrier-type, dynamic seal, which replaces the elastomer packing of conventional valves. The bellows flex to provide bubble-tight sealing of hazardous fluids, and since PTFE is not subject to chemical attack, exceptional performance, and a working life of over two million cycles is normal. The valve employs the patented Plast-O-Matic Fail-Dry safety design feature, which provides visual warning of any seal failure while allowing the valve system to continue operation and avoiding costly shutdowns. Piping connections in sizes .25 to one inch are offered in PVC, CPVC, Polypropylene, and PVDF (Kynar).