SERIES 100 General Equipment Gauge SERIES 200 Compressed Gas/ Welding Gauge SERIES 300 Refrigeration Gauge Ammonia Gauge SERIES 400 2.5" Diaphragm Gauge SERIES 500 Stainless Process Gauge SERIES 600 General Equipment Receiver Gauge SERIES 1000 4" All S.S. Process Gauge SERIES 1500 4.5" Process Gauge Configuration A 4.5" Process Gauge Configuration B SERIES 1600 Test Gauge SERIES 1700 Pressure Receiver Gauge SERIES 1800 4.5" Process Bellows Gauge SERIES 2000 Economy Process Gauge PRESSURE Gauge OPTIONS GENERAL INFO C SERIES S SERIES T SERIES E SERIES MINI SEALS   The 400 Series Diaphragm Gauge is designed to operate below 15 psig. Because a typical Bourdon tube gauge becomes insensitive at this range, a diaphragm is used to greatly enhance the gauge's sensitivity--as low as 0-15" water column. Indicating tank levels Measuring draft Filters Regulating natural gas Dial Size: 2.5" Case: Steel, painted black Ring: Steel, friction fit Window: Glass Pointer: Aluminum, black finish Movement: Brass, precision geared Diaphragm: Phosphor Bronze Connections: 1/4" LM or 1/4" CBM Brass    Model Selection Chart Range 1/4" LM 1/4" CBM 0-15" H2O 0431-B31GN000 0431-B41GN000 0-30" H2O 0431-B31GP000 0431-B41GP000 0-60" H2O 0431-B31GR000 0431-B41GR000 0-100" H2O 0431-B31GT000 0431-B41GT000 0-160" H2O 0431-B31GU000 0431-B41GU000 0-200" H2O 0431-B31GV000 0431-B41GV000 0-300" H2O 0431-B31GW000 0431-B41GW000 0-15 oz/sqin 0431-B31KP000 0431-B41KP000 0-30 oz/sqin 0431-B31KQ000 0431-B41KQ000 0-60 oz/sqin 0431-B31KR000 0431-B41KR000 20 oz/35" H20 0431-B31KS000 0431-B41KS000 0-3 psi 0431-B31GZ000 0431-B41GZ000 0-5 psi 0431-B31HA000 0431-B41HA000 0-10 psi 0431-B31HB000 0431-B41HB000 Steel Gauges Dial Size A B R T 2 .5" 2.48 1.48 1.2 1.51 Note: All Dimensions are shown in inches.