Standard Brass with NBR diaphragm wetted parts.
SPST creep action switch with Silver-plated contacts. Switch adjustment ranges from vacuum through 6,000 psi depending on model. NPT Male, 2 psig to 20 psig 350 psig, Deutsch 2-Pin Male DT04-2P. 100 Series Mechanical Compact Pressure Switch, Brass Wetted Materials, PI Diaphragm, 1 SPST, Normally Open, 1/8 in.