Standard Brass with NBR diaphragm wetted parts.
100 Series Mechanical Compact Pressure Switch, Zinc-Nickel Plated Steel Wetted Materials, BUNA-N Diaphragm, 1 SPST, Normally Closed, 1/8 in. 100 Series Pressure Switch, Brass, SPST, NC, 1/8" NPT, 50-150 psi, Weatherpack Shroud CE compliant to suppress Radio Frequency Interference RFI, Electromagnetic Interference EMI and Electrostatic Discharge ESD. Switch adjustment ranges from vacuum through 6,000 psi depending on model. NPT Male, 3,000 psig to 6,000 psig 9,000 psig.