The PlumbEZ Slimline Automatic Air Vent (1/2" BSP) is a compact, float-operated self-bleeding vent designed to remove trapped air from radiators, boilers and sealed (closed-loop) central heating systems. Releasing air as it accumulates helps reduce gurgling and noisy pipework, improves circulation, and can help prevent cold spots and corrosion caused by air in the circuit.
This model includes an integrated shut-off/check valve, allowing the vent to be removed or replaced for servicing without draining the system (when installed correctly). This makes it a practical choice for boiler rooms, cylinder cupboards, manifolds, radiator risers and towel rail circuits where downtime and access can be a headache.
How it works
Inside the vent, a float mechanism responds automatically: when air collects in the chamber the float drops to open the outlet and release air; when water rises back into the chamber the float lifts to close the seal. For best performance, install the vent upright/vertical at a high point in the system where air is likely to gather.
Key features
- Automatic air removal for sealed heating systems
- Slimline body for tight spaces
- 1/2" BSP connection – common heating thread
- Shut-off/check valve for servicing without draining (when fitted correctly)
- Brass construction suitable for typical domestic & light commercial hydronic systems
- Compatible with common corrosion inhibitors and glycol antifreeze blends used in sealed systems
Where to fit
- At high points near boilers (flow/return headers)
- Top of risers / high pipe runs
- Near manifolds and distribution points
- Heating circuits feeding towel rails
Installation note: Fit vertically and follow system best practice. Ensure the vent is positioned where it can safely discharge small amounts of air and moisture during operation.
| Brand | PlumbEZ |
|---|---|
| Type | Automatic air vent (float operated) |
| Connection | 1/2" BSP |
| Material | Brass |
| Feature | Integrated check/shut-off valve |
| Installation | Vertical/upright |
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Q: What does an automatic air vent do?
A: It automatically releases trapped air from a sealed heating system, helping to reduce gurgling noises, improve circulation and prevent radiator cold spots.
Q: Where should I fit it?
A: Fit it upright/vertical at a high point where air collects, such as near boiler flow/return headers, the top of risers, or near manifolds.
Q: What is the thread size?
A: 1/2" BSP.
Q: What does the check/shut-off valve do?
A: It allows the vent to be isolated locally so it can be serviced or replaced without draining the whole system (when installed correctly).
Q: Can it be installed horizontally?
A: No, it should be installed upright/vertical so the float mechanism can work correctly.
Q: Is it suitable for sealed central heating systems?
A: Yes, it’s designed for radiators, boilers and closed-loop heating circuits.
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