Ashcroft Instruments 451188A-02B Back Connection Gauge

Ashcroft 451188A-02B Back Connection Gauge is a 4-1/2" dial, low‑pressure bellows gauge built for back‑of‑panel installation. It features a phenolic case with a solid front and a 1/4" NPT male process connection located on the back (back connection, code B). The A in the model code denotes brass bellows with brass process connection, paired with back mounting for a compact, robust sensing element. This instrument is part of Ashcroft's 1188 family, engineered for accurate low‑range measurements and reliable operation in environments where only rear access is available. Range selections in this family are commonly specified in inches of water (IW); for example, 10IW corresponds to 10 inches of water, enabling precise monitoring of small pressure differentials in instrumentation loops or panel‑mounted control systems. The combination of a sturdy phenolic case, brass bellows, and back‑connection configuration provides a compact, durable gauge suitable for installation in equipment cabinets, test benches, or process lines where a rear‑facing display is required.