The Filter Change Indicator for Hydrogen Sulfide Gas Hydrogen waterproof (Sulfide Gas BTI WP, PN: 197) is qualitative (yes/no) colorimetric indicator for the saturation and end-of-service life of carbon absorbers. It is designed to provide real-time indication of the breakthrough of Hydrogen Sulfide Gas. Dimensions: 89.9mm (3.5in), diameter 24.5mm (1.0in), Inlet thread: 3/4" MNPT
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