Flamco Flexvent 1/2" Floatvent c/w shut-off valve - Automatic Air Vent 27740
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Flamco Flexvent 1/2" Floatvent c/w shut-off valve - Automatic Air Vent 27740

Product ID: 52389645
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Details

  • Material
    Messing
  • Brand
    Flamco
  • Item dimensions L x W x H
    23 x 3 x 80
  • Exterior finish
    Brass
  • Inlet connection size
    230
  • Inlet connection type
    1 1/4 inch
🔥Operates up to 120°C peak
⚙️Compact 23x3x8cm design
🛡️Pressure resistant to 10 bar max

Description

🔥 Keep your system flawless — vent smart, vent Flamco! ⚙️

  • COMPACT VERSATILE - Ultra-slim 1/2" size fits effortlessly into tight spaces for sleek, professional installations.
  • SEAMLESS AIR REMOVAL - Automatically vents trapped air to optimize heating efficiency and prevent system corrosion.
  • BUILT IN SHUT OFF VALVE - Integrated valve allows quick isolation for maintenance without system downtime.
  • ROBUST THERMAL TOLERANCE - Engineered to withstand continuous operation up to 90°C and peaks of 120°C without compromise.
  • CERTIFIED QUALITY ASSURANCE - CE, ISO 9001, and RoHS certified with factory-tested reliability for peace of mind.

The Flamco Flexvent 1/2" Floatvent with shut-off valve is a precision-engineered automatic air vent designed for glycol-based heating and cooling systems. Its compact brass construction supports pressures up to 10 bar and temperatures up to 120°C peak, ensuring reliable air removal and system protection. Certified to CE, ISO 9001, and RoHS standards, it offers professional-grade durability and easy maintenance with an integrated shut-off valve.

Specifications

ManufacturerFlamco
Part Number27740
Product Dimensions23 x 3 x 80 cm; 100 g
Item model number27740
SizeR½"
ColourRed
MaterialMessing
Item Package Quantity1
Maximum Pressure1E+1 Bars
CertificationCE, ISO 9001, RoHS
Included ComponentsNo
Batteries included?No
Batteries Required?No
Item Weight100 g

Have a Question? See What Others Asked

Hello - does this connect directly to 15mm copper pipe or does it need an adaptor?
Can I screw this straight into the top of my towel rail replacing the manual bleed valve? Will I need ptfe tape?
what is the Product Dimensions?
Does the valve need to be fitted vertically

Reviews

L**G

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.

R**A

Good quality

Great

M**F

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.

A**R

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.

M**.

perfect replacement for boiler vent

Simple to install yourself, has a ptfe collar built in, tighten to the lip, but don't compress/overtighten the ptfe lip, so only needs a tiny 1/2 width tape over the thread

A**N

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.

J**N

There was part of the AAV missing.

The vent red top was missing so really can use one of these. Really not happy, and it was late as well

G**L

Best Price I found

Great Product and a flawless seller. Thanks very much. Saved me a few quid too :)

Common Questions

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Ravi S.

I loved the variety of products available. Will definitely shop again.

2 months ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Flamco Flexvent 1 2 Floatvent C W Shut Off Valve | Desertcart Chile