$98.60
4-1/2 in altitude gauge with dual 0-100 PSI and 0-231 ft H2O scale — black steel case, flat glass window, phosphor-bronze Bourdon tube, brass socket, 1/4 in NPT low mount. For water-tank level and boiler altitude indication.
3-1/2 in altitude gauge with dual 0-100 PSI and 0-231 ft H2O scale — black steel case, flat glass window, phosphor-bronze Bourdon tube, brass socket, 1/4 in NPT low mount. For water-tank level and boiler altitude indication.