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Basic Series 101/121 differential pressure switches with standard wetted parts are normally
suitable for air, oil, water and non-corrosive processes. Refer to the Quick Selection Guide section
on page 4. Corrosive service and particular customer requirements may require optional
components. Refer to the How to Order section on this page or the dedicated page to locate
optional components, such as: housings, switching elements, diaphragm systems, pressure ports
and accessories. Each position in the model number, except Accessories, must have a designator.