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💨 Keep your system flawless with Flamco’s stealthy air-busting pro!
The Flamco Flexvent 1/2" Floatvent is a compact, brass automatic air vent valve designed for heating systems with glycol content up to 50%. It efficiently removes trapped air to prevent corrosion and improve heat transfer, operating reliably up to 120°C and 10 bar pressure. Factory-tested and certified, it’s the trusted choice for professional-grade central heating maintenance.
| Asin | B00GXNNGPY |
| Best Sellers Rank | 128,442 in DIY & Tools (See Top 100 in DIY & Tools) 1,066 in Central Heating System Accessories |
| Brand | Flamco |
| Connector Type | Threaded |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,255) 4.5 out of 5 stars |
| Exterior Finish | Brass |
| Included Components | No |
| Inlet Connection Size | 230 Millimeters |
| Inlet Connection Type | 1/2" Male Thread |
| Item Dimensions | 23 x 3 x 80 centimetres |
| Item Type Name | Flamco Flexvent R1/2 inch Radiator Bleeder Automatic, Float Vent Heater, Quick Bleed, Thermostatic Valve, Flexvent Vent 27740 |
| Item Weight | 100 Grams |
| Manufacturer | Flamco |
| Material | Messing |
| Maximum Pressure | 10 Bars |
| Model Number | 27740 |
| Number Of Items | 1 |
| Number Of Packs | 1 |
| Number Of Pieces | 1 |
| Number Of Ports | 2 |
| Outlet Connection Size | 0.5 Inches |
| Outlet Connection Type | External thread |
| Part Number | 27740 |
| Set Name | Flamco Flexvent 1/2" Floatvent 27740 |
| Size | R½" |
| Specification Met | CE, ISO 9001, RoHS |
| Thread Size | 1/2" |
| Thread Type | 1/2 inch |
| Unit Count | 1.0 count |
| Valve Type | Float Valve |
User
Nice
Does the job, fitted to the top of a wall heated towel rad, that got all the air buildup. So yes ok
User
Good product. Easy to install
These are good bleed valves.
User
It's 1/2 inch and comes with a closure valve.
Easy to install and seems to work. Give it 4 weeks and I'll come back and buy a few more if it successfully clears air buildup in my manifolds.
User
Good quality valve with very fast delivery.
Discovered a leaking valve at 7pm, ordered this one at 8pm and it was delivered at 8am the following morning. Valve exchanged and no more leak! Very happy with the product itself. It appears to be the latest version of the one that failed, and that one was fitted over 20 years ago.
User
Does exactly what it says on the box
Purchased this to replace the old barrel design plastic air vent on my central heating system that was leaking. It took considerably more effort to bleed and refill the system (and getting rid of the subsequent air locks), than to fit this. A couple of layers of white plumbers tape, and it fitted perfectly without any leaks. It is clearly better built than the plastic valve as well, and operates much better.Although it doesn't come with any instructions, if you download the Flamco manual it recommends that you loosen the cap before filling the system and tighten afterwards. The location of the valve is critical as well, it should be on the highest point of the system after the water pump to prevent air being drawn into the system.While not a "Silver bullet" for a central heating system with an airlock issue, the Flamco was not designed to be that. There are many reasons for airlocks occurring in a domestic CH scenario, and an airvent valve may or may not be the solution. If you purchase it as a replacement part with this in mind, you won't go wrong.
User
Good quality
Great
User
Works perfectly - make sure you buy the right size
Make sure you buy the right size according to your pipework and use case - there is a 3/8" and 1/2" versionThese are excellent at getting air out of the system and really work. I have an unvented cylinder in my loft and have fitted this on the primary circuit at the highest point in the system. You can hear it work on air immediately and my system has never had any air locks or required time consuming purging even after a full drain down and fill.I suggest using Loctite 55 instead of PTFE for sealing the thread.
User
Flamco flexvent
I bought six of them and fitted with a professional instaler. One of them had a leak and I needed to drain the system again and instal a spare one from another manufacturer. They need to have a better quality control.
User
erfüllt voll und ganz sein zweck
erfüllt voll und ganz sein zweck
User
Bra köp
Mycket bra, inget krångel eller läckage
User
Buena relación calidad precio
Instalé estos purgadores automáticos en la instalación de mi caldera de gasoil hace ya varios meses y la experiencia está siendo muy positiva. Desde el primer momento se veía que constructivamente eran de buena calidad, bien acabados y robustos.Con el paso del tiempo lo he podido confirmar: después de varios meses funcionando, siguen trabajando perfectamente, sin fallos ni pérdidas. Cumplen su función sin tener que preocuparse de nada.Producto fiable y recomendable.
User
Buena calidad
Se ha sustituido por otro igual de una caldera Roca. Buena calidad.
User
Perfetta
Tutto perfetto e funziona alla grande
Trustpilot
2 weeks ago
3 days ago