Ashcroft 45-1188-22-SS-04L-20IW Pressure Gauge

The Ashcroft 45-1188-22-SS-04L-20IW is a 4-1/2-inch low-pressure bellows gauge from the 1188 series, designed for precise measurement of very low pressures such as 20 inches of water column. It offers ASME-grade accuracy (±2% to ±1% of span, depending on range) with solid-front construction and a glass window (optional shatter-proof glass), making it suitable for harsh industrial environments. Wetted parts are available in bronze, 316 stainless steel, or Monel, and the instrument can be configured with diaphragm seals if needed; the configuration supports 1/4" NPT or 1/2" NPT process connections located at the lower or back of the gauge. Typical applications include HVAC and process systems, oil and gas, chemical and petrochemical plants, and water/wastewater pressure control, or equipment skids that require sensitive, reliable low-pressure readings.