Conbraco Industries 20-251-00 Water Gauge

The Conbraco Industries 20-251-00 is an industrial-grade heavy pattern bronze water gauge designed for precise fluid level verification in high-demand steam and boiler applications. This Apollo water gauge set features a 1/2" NPT male connection and comes standard with 5/8" OD x 12" length glass, providing a clear liquid level sight gauge for real-time monitoring. Engineered with a rough bronze finish, this unit is built for durability in mechanical rooms. The integrated automatic ball checks provide critical protection by sealing the flow of fluids in the event of glass breakage, a standard requirement for safety-conscious contractors. With a pressure rating of 400 PSI at 100°F and 200 PSI at 400°F, this gauge set includes EPDM glass seals and Teflon stem packing for superior leak resistance. The composite plastic handwheel reduces heat transfer, ensuring safe manual operation during boiler water level indicator maintenance.

• Automatic Safety Shut-off: Features vertically rising automatic ball checks to prevent fluid loss and minimize property damage if the sight glass fails.
• High-Temperature Reliability: Rated for up to 400°F, making it suitable for standard pressure steam boiler environments.
• Sealing Performance: Outfitted with TFE/Teflon stem packing and EPDM gaskets to maintain a tight seal under thermal cycling.
• Rugged Construction: The heavy-pattern bronze body (ASTM B584) ensures long-term resistance to corrosion and mechanical stress compared to light-duty alternatives.
• Full Installation Kit: Includes coated steel guard rods and a 1/4" needle drain valve for comprehensive sight glass valve assembly.

What is the purpose of the automatic ball checks in the 20-251 series?
The automatic ball checks are safety features designed to seat against the orifice if the glass breaks. The resulting pressure differential forces the balls into position, stopping the escape of hot water or steam.

Does the 20-251-00 meet ASME boiler code requirements?
Yes, this 1/2 inch NPT water gauge is designed to meet ASME requirements for liquid level verification on power boilers and pressure vessels, provided the application falls within its specific pressure and temperature envelopes.

Can I use a longer sight glass with this valve set?
While this set includes a 12" glass, it is compatible with 5/8" OD glass of various lengths. Note that the guard rod length must be adjusted (Glass Length + 2") to ensure proper protection of the sight tube.

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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.