The Castel 3910/66 moisture indicator is engineered to provide a clear visual check of moisture presence within refrigeration and air conditioning systems. With a 3/4″ male flare connection, it installs easily into compatible refrigerant lines and offers a clear viewing window that signals moisture conditions. Its durable, professional-grade construction makes it suitable for installation, inspection, and routine maintenance in commercial and industrial cooling systems where early moisture detection helps prevent performance issues and protect critical components.

Key Benefits

Provides clear visual indication of moisture contamination
Helps detect moisture early to protect system components
Supports accurate diagnostics and maintenance checks
Durable design for reliable, long-term performance
Improves overall system efficiency and reliability

Specifications

Product Type: Moisture Indicator
Model: 3910/66
Connection Size: 3/4″ Male Flare
Category: Refrigeration Valves & Accessories
Sub-Category: Sight Glasses & Moisture Indicators
Application: Refrigeration and air conditioning systems
Function: Visual monitoring of moisture condition
Brand: Castel

Applications

Moisture monitoring in HVAC and refrigeration systems
Refrigerant line inspection and diagnostics
Commercial and industrial cooling maintenance
Professional HVAC and refrigeration servicing

FAQs

What does the 3910/66 moisture indicator do?
It visually shows moisture levels in the refrigeration or air conditioning system.

What connection type does this indicator use?
It features a 3/4″ male flare connection.

Why is moisture detection important?
Moisture can cause corrosion, freezing, and performance issues, so early detection helps prevent damage.

Is this indicator suitable for professional HVAC servicing?
Yes, it’s designed for commercial and industrial refrigeration and air conditioning applications.

Does it support diagnostic and maintenance work?
Yes, its clear viewing window helps technicians monitor system condition confidently.