Conbraco 21-104-03 Valves

The Conbraco 21-104-03 is a professional-grade water gauge valve set designed for reliable fluid level monitoring in commercial boiler and tank applications. Constructed from high-quality rough bronze, these 1/2" NPT male valves feature extended shanks to facilitate easier installation through thick insulation or vessel walls. The assembly utilizes an EPDM glass seal and Teflon stem packing to ensure leak-free performance under thermal cycling. Rated for 125 PSI at 350??F and 300 PSI at 100??F, this Apollo valves set is built to withstand rigorous mechanical room environments. The aluminum type wheel provides a tactile, heat-resistant grip for precise manual control. Technicians typically specify the 21-104-03 series for its robust steam boiler water gauge compatibility and its ability to maintain secondary containment integrity in high-pressure hydronic systems. This component ensures accurate visual diagnostics while meeting standard industrial pressure vessel requirements.

• High-Pressure Tolerance: Rated for 300 PSI at ambient temperatures, making it suitable for high-head pumping systems.
• Chemical Resistance: Equipped with Teflon stem packing and EPDM seals to prevent degradation from common water treatment chemicals.
• Extended Shank Design: Simplifies mounting on insulated tanks without the need for additional pipe nipples.
• Durable Construction: Rough bronze body resists dezincification and corrosion in harsh boiler feedwater environments.
• Manual Precision: Aluminum handwheel ensures reliable operation and longevity compared to plastic alternatives.

What is the maximum operating temperature for these valves?
The Conbraco 21-104-03 is rated for heavy-duty service up to 350??F at 125 PSI.

Are these valves compatible with glass or plastic sight tubes?
These valves are designed to secure standard 5/8" OD glass tubing using the integrated EPDM seals for a pressure-tight fit.

Do these valves include a drain cock?
Yes, the lower valve typically permits the installation of a drain valve for flushing sediment and clearing the sight glass.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.