All thermoplastic [PVC, CPVC (Corzan), Natural Unpigmented Polypropylene or PVDF (Kynar)] Series SWT pressure switches are to be of two piece construction (upper and lower housing) with a one piece flexible [PTFE (standard for pressures above 15 PSI) diaphragm between them as a barrier seal. The upper and lower housing are to be joined using six (6) stainless steel assembly screws to effect a uniform, secure and vibration free sealed assembly. All units are to have a 1/2" NPT process connection. Maximum operating pressure of 150 PSI. Nema 4X design with patented Fail-Dry to enhance system safety. Electrical switch is UL recognized and CSA approved. Corrosion-resistant plastic cord grip and 18” cable simplify installation. Versatile snap action 16 Amp/3 terminal switch standard and low dead band 3 Amp switches optional. All units are to be 100% individually tested at the factory. As manufactured by Plast-O-Matic Valves, Inc., Cedar Grove, NJ.