Ensure the health and efficiency of your refrigeration and HVAC systems with the Castel Ø 1/2″ Humidity Indicator. When moisture appears in your lines, the indicator turns from blue to pink/red, giving you an immediate, easy-to-read alert.
Instant Visual Alerts: Color-coded change for quick moisture detection.
½″ Standard Thread: Seamless fit into common refrigerant lines.
Robust Brass Construction: Resists corrosion and wear for long-lasting use.
Models 3940/4 & 3740/4: Designed for compatibility and reliability.
Rely on Castel’s precision-engineered humidity indicators to streamline maintenance, prevent moisture damage, and extend equipment life—order yours today.
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This part is compatible to the original part number. Part numbers are always leading.
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Features & Benefits
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Features
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