Flamco - Flexvent Compact Automatic Air Vent - 3/4

The Flamco - Flexvent Compact Automatic Air Vent - 3/4 is a component designed to support the intended pump or pipework installation.

It is built to help maintain dependable system performance while giving installers and end users a practical, dependable solution for the application.

Automatic air removal made simple: Flamco Flexvent floating air vents purge trapped air continuously to protect pumps, valves and emitters in sealed systems.

A brass housing with an all-plastic internal mechanism uses a float-operated valve to open when air accumulates and close again once water returnsno manual intervention needed. Versions with a valve sleeve (shut-off valve) in ⅜", " and " sizes feature a self-sealing notched gasket for tape-free installs.

• Captive cap with user-friendly open/close and leak-prevention
• Quick installation: self-sealing gasket on valve-sleeve models (⅜", ", ")
• Reliable operation: large water/closure gap reduces contamination risk
• Factory tested: every Flexvent is function-tested before dispatch
• No drain-down routine venting during normal operation

Key Product Features

• Application: automatic air venting for heating and cooling systems
• Body: closed brass housing; internal components plastic
• Mechanism: float-controlled valve opens on air, closes when refilled
• Install options: versions with valve sleeve (shut-off) in ⅜", ", "
• Sealing: self-sealing notched gasketno sealing tape required
• Service: captive cap with easy open/close; leak-prevention design
• Quality: each unit factory tested for performance

Flamco (est. 1956) is a Dutch manufacturer of HVAC and plumbing system components, including expansion vessels, air separators and pressurisation accessories. Their ranges are used in heating and chilled-water circuits and potable water systems across domestic and commercial installations.