A CO2 washer (or CO2 regulator seal) is a small, durable gasket typically made of nylon, fibre, or rubber—designed to create a high-pressure, air-tight seal between a CO2 cylinder and a regulator. It prevents gas leaks (empty tank syndrome) and is essential for beer kegging, aquarium CO2 systems, and hydroponics.
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Purpose: Ensures a secure connection, preventing expensive and dangerous CO2 leaks.
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Material: Often made of durable, white Nylon or hard plastic
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Compatibility: Commonly designed for standard CGA-320 connections (North America).
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Placement: Placed directly between the regulator nut/stem and the tank outlet.
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Maintenance: It is best practice to replace the washer every time the CO2 cylinder is refilled.
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Signs of Failure: A hissing sound at the tank connection or a regulator gauge reading zero despite a full tank.
