Ashcroft 451188AS 02L General Service Gauge Four And One Half Inch

Ashcroft 451188AS02L is a 4-1/2-inch dial, low-pressure bellows gauge with stainless steel bellows, presented in a phenolic case with a solid front. It measures 0 to 60 inches of water (0–60 inH2O) via a lower 1/4" NPT male connection (02L). The 'AS' suffix denotes the stainless steel bellows option, while the '02L' code indicates the connection size and location. Designed for dry-dial operation in pressure ranges typical for HVAC and instrumentation, this gauge is suitable for monitoring small differential pressures in air and non-corrosive gas lines and is commonly panel-mounted or surface-mounted in control panels and mechanical rooms. The 4-1/2-inch diameter offers clear, easy-to-read readings from a distance, and the instrument is part of Ashcroft's 1188 family of gauges known for reliability in low-pressure service. Optional enhancements such as traceable calibration certificates (C4) or oxygen-service-ready configurations can be specified according to Ashcroft datasheet guidelines.