Conbraco 98-58I-12 High Pressure Gage Glass 305 Psi

Product Description

The CONBRACO 98-58I-12 is a high pressure liquid level gage glass designed for boiler and pressure vessel applications requiring reliable visual level indication at elevated operating pressures. Rated to a working pressure of 305 psi, this gage glass is suitable for demanding service conditions where standard-pressure sight glasses are not adequate. The glass measures 12 inches in length and is sized for a 12mm outer diameter fitting, or approximately 0.63 inches. Installation is handled by licensed plumbers, steamfitters, or boiler technicians as part of a properly rated gauge assembly.

This gage glass is used in residential and commercial boiler systems, steam generators, and pressurized vessels where operators need a direct visual indication of liquid level. The 12-inch length fits standard gage glass valves configured for 12mm tube sizes. Applications typically include hot water and steam boilers, condensate systems, and industrial pressure vessels where continuous level monitoring is required. Verify working pressure rating compatibility with the valve set and vessel rating before installation.

Key Features

• 305 psi maximum working pressure rating for high-pressure service
• 12-inch length suits standard gage glass valve assemblies
• 12mm outer diameter sizing for common gage glass fittings
• Approximately 0.63 inches outer diameter for precise valve compatibility
• Single-piece glass construction provides unobstructed liquid level view

Compatibility

Designed as an OEM-style replacement gage glass for high-pressure liquid level gauge assemblies rated to accept 12mm tube stock at working pressures up to 305 psi.

Installation Notes

Installation should be performed by a licensed plumber, steamfitter, or boiler technician in accordance with applicable local codes and ASME boiler and pressure vessel requirements. Always depressurize and isolate the vessel fully before removing or installing a gage glass. Use properly rated packing nuts, washers, and end fittings matched to the glass diameter. Do not overtighten end fittings, as excessive compression can fracture the glass.