Model 123 differential pressure gauges handle pressures to 400 psid. Available in aluminum or 316/316L stainless-steel bodies, 316 stainlesssteel springs and internal parts, and a variety of elastomers. Fully over-range protected in either direction up to the maximum rated safe working pressure of 5000 psi. Hermetically sealed SPST or SPDT magnetically actuated reed switches are optional to provide high or low alarm control. Available in 2½-, 3½-, or 4½-in. dials.