Air vent Comap Flovent R1/2 — automatic radiator/pipe air separator, model 27792

The Comap Flovent R1/2 model 27792 is an automatic air vent for heating and plumbing systems designed to expel trapped air from radiators and pipelines. Its compact body and R1/2 threaded connection make it suitable for fitting directly to radiators, manifolds or pipe runs in residential and light commercial installations. By continuously releasing air pockets, the device helps maintain hydraulic balance, reduces gurgling and knocking noises, and supports more consistent heat transfer throughout the system.

Advantages

The Flovent R1/2 operates automatically without need for manual bleeding, providing continuous air separation to limit corrosion and improve circulation. Its small size allows installation in confined spaces on radiators, distribution headers or horizontal and vertical pipework. The sealed float mechanism is designed for reliable operation under usual heating system pressures and temperatures, and the visible vent outlet makes it easy to check function during routine maintenance.

Suitable for

• Domestic radiator systems where air accumulation causes noise or uneven heating
• Underfloor heating manifolds and distribution headers in low- to medium-pressure systems
• Small commercial heating circuits and service risers where automatic venting is preferred
• Replacement of manual air vents to achieve automatic continuous deaeration

When it may not be suitable

The Flovent R1/2 is intended for typical residential and light commercial heating or plumbing systems; it may not be suitable for high-pressure industrial systems or installations requiring engineered air separation at very high flow rates. Installations that demand integrated dirt separation, magnetic filtration or large-capacity air separators should consider combined or dedicated units rather than a compact automatic vent.

Key specifications

• Connection type: R1/2 threaded connection
• Application: automatic air vent for radiators, manifolds and pipework
• Construction: compact body suitable for confined installation locations
• Operation: automatic float-operated venting mechanism
• Typical use: residential and light commercial heating and plumbing systems

How to use

Install the Comap Flovent R1/2 in a vertical orientation at a high point in the radiator, manifold or piping where air accumulates. Ensure the system is depressurised and cool before fitting. Thread the vent into an appropriate R1/2 female port and tighten to the manufacturer’s recommended torque; use suitable sealing material on the thread if required. Once the system is refilled and pressurised, the internal float mechanism will open to release trapped air and close when liquid reaches the outlet. Periodically inspect the vent for leaks and confirm the outlet is not obstructed.

What to consider before purchase

• Verify the connection size (R1/2) matches the port on your radiator, manifold or pipe fitting
• Confirm the device’s materials and pressure/temperature ratings are compatible with your system
• Assess whether an automatic vent alone meets your system needs or if combined air/dirt separation is required
• Plan space and orientation for vertical installation at system high points

Usage recommendations

Fit the Flovent R1/2 at the highest practical point in the circuit and check it during routine maintenance. Replace if leaking or if the vent no longer discharges air reliably. For systems with persistent air ingress, investigate sources such as leaks, pump cavitation or inadequate filling procedures and consider additional air/dirt separation measures.