PSI provides a full line of field adjustable pressure switches that are precision machined from aluminum extrusions.  Internal parts are either stainless steel or anodized aluminum. 

Three series of pressure switches are presently offered. All models have extremely rugged enclosures that are precision machined from aluminum extrusions. Internal parts are either stainless steel or anodized aluminum extrusion. The pressure fittings are machined from either aluminum or stainless steel. All markings are laser engraved for long term readability.