What it does and why you need it Automatic brass exhaust valve that removes trapped air (air locks) from solar water heater and home heating systems to restore smooth flow and prevent loss of heating efficiency. Automatically vents air without manual bleeding, keeping system pressure stable and reducing wear on pumps and components. Key features Material: Cast brass construction for corrosion resistance and long service life. Mechanism: Diaphragmdriven automatic exhaust that operates quietly and reliably within the normal operating pressure range of heating systems. Connections: Standard male thread sizes — fits 1/2', 3/4', or 1' fittings for easy replacement and installation. Operation: Automatic, maintenance venting that prevents recurring air buildup and helps maintain consistent heat delivery. Benefits at a glance Eliminates air locks to restore efficient circulation and steady heat output. Reduces the need for manual intervention and frequent system checks. Durable, rustproof brass reduces replacement frequency and downtime. Simple dropin replacement for common solar water heater and hydronic system fittings. Typical applications Solar water heater collector loops — installs at points to purge trapped air and maintain collector performance. Domestic hydronic heating manifolds and circulation circuits — keeps radiators and underfloor zones operating evenly. Pump suction and lines — protects pumps from cavitation and extends component life by preventing trappedair damage. Installation and compatibility Designed to screw directly into standard 1/2', 3/4', or 1' male threaded ports; no special adapters required in most systems. Suitable as a direct replacement part in residential solar water heaters and common home heating installations. This automatic brass exhaust valve provides a simple, durable solution for air removal in solar and hydronic heating systems, improving flow, protecting equipment, and reducing maintenance.