... corrosive atmospheres, the 117 Series can be used to measure vacuum, pressure, differential pressure or temperature in a variety of ... knockouts preSSure connection Models 218, 358-376, 700-706: 1/4” NPT (female); models 171-194, 483-494, 520-535: ... optional 316L stainless steelfill Non-toxic oil filledtemperature deadband Typically 4% of range under laboratory conditions (70°F ambient circulating ...