The 15mm Pro Automatic Bottle Air Vent Valve Caleffi 1/2" AVENT2 135355 is a high-performance automatic air release valve designed for heating and cooling systems, such as central heating boilers and closed-circuit plumbing networks. Manufactured by Caleffi, this heavy-duty brass valve is engineered to automatically discharge trapped air from pipework and radiators without requiring manual bleeding, ensuring optimal thermal efficiency and quiet system operation.
 
Featuring an internal float-operated mechanism, the valve opens when air accumulates at high points in the system and seals tightly shut as soon as water fills the chamber, preventing leaks and pressure loss. Its durable brass body and internal components are built to withstand high operating temperatures, water treatment chemicals, and system pressure fluctuations over long operational lifespans.
 
Essential for preventing air locks, corrosion, and pump cavitation in domestic and commercial heating installations, this automatic air vent delivers reliable, maintenance-free air management. Whether you are installing a new boiler system, upgrading a central heating network, or replacing a faulty vent, this Caleffi valve ensures professional-grade reliability and optimal hydraulic performance.