Industrial 81-1234 Air Filter Restriction Gauge

The Industrial 81-1234 Air Filter Restriction Gauge from Universal Silencer (Dürr Universal) provides a mechanical, visual readout of filter element pressure drop from 0 to 20 in H2O, signaling when service or replacement is required. Engineered for blower inlet filters, compressor intake filters, and filter silencers, this gauge enables continuous monitoring of filter condition across industrial air handling equipment. It retains the highest restriction reading even after shutdown and is reset by a manual push button after filter replacement. Specifications include a 1/8 in Male NPT connection; mounting options of Direct Nozzle Mount or Weather-hood Mount; compatibility with blower filters, compressor intake filters, and filter silencers; and compatibility with filter series CBF, CBFI, CCF, CF, CCS, CS, FH, FSH, FRH, FCRH, FASH, FMH, ILF, ILFS, RF, RFY, RFS, and RFSY. The device features a mechanical visual indicator, no external power required, and a construction described as an industrial-grade mechanical gauge. It is designed for industrial manufacturing and process facilities and is a legacy product still available through industrial suppliers and surplus markets. Common replacements include the Universal Silencer 81-1026 MAGNEHELIC Gauge, the Dwyer MAGNEHELIC Differential Pressure Gauge, and the Ashcroft Differential Pressure Filter Gauge.