Crown Boiler Sight Glasses

Overview

The CROWN BOILER CR-GGW58-12 is a pack of 12 rubber washers designed to seal and support 5/8-inch OD gauge-glass tubes in boiler sight-glass assemblies. These washers are molded from heat-resistant elastomer suited for standard hydronic and steam boiler operating conditions. They create a reliable seal around the gauge glass, preventing leaks and maintaining fluid-level visibility. Licensed boiler technicians and plumbers install these washers during routine sight-glass maintenance or full sight-glass replacement. The pack-of-12 quantity supports technician stocking and reduces multiple service trips for a common wear item. The CR-GGW58-12 washers are used in hydronic heating systems and steam boiler installations where sight-glass assemblies require periodic resealing. Sight-glass washers are a routine maintenance consumable — they harden or compress over time, leading to minor seepage around the gauge glass. Replacing them during any sight-glass service restores a proper seal and supports accurate water-level readings. These washers are appropriate for residential and light commercial boiler applications where 5/8-inch gauge glass tubing is installed. Key Features 5/8-inch ID sizing fits standard 5/8-inch OD gauge-glass tubes Heat-resistant elastomer construction suited for boiler service temperatures Pack of 12 washers supports technician inventory stocking Prevents seepage and leaks at sight-glass fittings Suitable for hydronic and steam boiler sight-glass assemblies…