The compact Series P2 Flow Switch with piston-type design is suitable for air and pure water applications. The switches hold preset actuation points from 0.05 to 1.0 GPM for water and 25 CFH to 5 CFM for air. The piston design incorporates a hermetically sealed SPST magnetic reed switch. The P2 is comprised of PPE & PS (polyphenylene ether and polystyrene) housing, piston, 316 stainless steel spring, stop pin and FDA compliant wetted parts. The superior and economical design of the series makes it an excellent switch for pure water equipment, filter life monitoring, heat exchangers, and cooling applications.