PSF100A-0.5 0.004 - 0.018 PSI pressure switch by Multicomp. 25.4mm square polycarbonate body x 9.2mm deep. Polyurethane diaphragm. SPST NO 30Volt 40mA rated contacts with spade connector. In/Out Ports: 0.2" diameter barbed to accept 3/16" tubing. (see photo) switching medium: air or compatible fluids on high side. Status VNOS (Very New Old Stock) RoHS compliant: YES