---
product_id: 52389645
title: "Flamco Flexvent 1/2\" Floatvent c/w shut-off valve - Automatic Air Vent 27740"
brand: "flamco"
price: "€ 44.35"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.it/products/52389645-flamco-flexvent-1-2-floatvent-c-w-shut-off-valve
store_origin: IT
region: Italy
---

# Handles up to 120°C peak temp Pressure rated to 10 bar max Compact 1/2" size for versatile installs Flamco Flexvent 1/2" Floatvent c/w shut-off valve - Automatic Air Vent 27740

**Brand:** flamco
**Price:** € 44.35
**Availability:** ✅ In Stock

## Summary

> ⚡ Elevate your HVAC game with precision venting power!

## Quick Answers

- **What is this?** Flamco Flexvent 1/2" Floatvent c/w shut-off valve - Automatic Air Vent 27740 by flamco
- **How much does it cost?** € 44.35 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/52389645-flamco-flexvent-1-2-floatvent-c-w-shut-off-valve)

## Best For

- flamco enthusiasts

## Why This Product

- Trusted flamco brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Seamless Integration:** Ultra-compact design fits effortlessly into any heating system, saving space without compromising performance.
- • **Precision Air Venting:** Automatic float vent with shut-off valve efficiently removes trapped air, optimizing system efficiency and reducing maintenance downtime.
- • **Robust Thermal Tolerance:** Operates reliably up to 90°C continuously, with a peak tolerance of 120°C—perfect for demanding HVAC environments.
- • **Pressure-Ready Durability:** Engineered to withstand pressures up to 6 bar in regular use and peaks up to 10 bar, ensuring system safety and longevity.
- • **Certified Quality Assurance:** CE, ISO 9001, and RoHS certified with factory-tested nozzles for guaranteed reliability and peace of mind.

## Overview

The Flamco Flexvent 1/2" Floatvent with shut-off valve is a compact, high-performance automatic air vent designed for residential heating systems. It supports glycol mixtures up to 50%, withstands continuous temperatures up to 90°C (peaking at 120°C), and pressures up to 6 bar (peaking at 10 bar). Certified to CE, ISO 9001, and RoHS standards, it ensures reliable air removal and system efficiency with a durable brass construction and factory-tested quality.

## Description

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

## Features

- The Flamco Flexvent 1/2 inch vent valve is suitable for house installations with a glycol content of up to 50%.
- Thanks to its extremely compact shape, the Flexvent 1/2 inch bleed valve can be easily installed in any system that can be installed at a temperature below 90°C (with a peak of max. 120°C) and a pressure of 6 bar (with a peak of max. 10 bar).
- As a quality guarantee, every Flamco nozzle is tested before it leaves our factory.
- The Flexvent seal seat is protected from dirt as the protective chamber is placed on the float

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Flamco |
| Part Number | 27740 |
| Product Dimensions | 23 x 3 x 80 cm; 100 g |
| Item model number | 27740 |
| Size | R½" |
| Colour | Red |
| Material | Messing |
| Item Package Quantity | 1 |
| Maximum Pressure | 1E+1 Bars |
| Certification | CE, ISO 9001, RoHS |
| Included Components | No |
| Batteries included? | No |
| Batteries Required? | No |
| Item Weight | 100 g |

## Product Details

- **Material:** Messing
- **Brand:** Flamco
- **Item dimensions L x W x H:** 23 x 3 x 80 centimetres
- **Exterior finish:** Brass
- **Inlet connection size:** 230 Millimeters
- **Inlet connection type:** 1/2" male threaded
- **Outlet connection type:** 1,27 cm Außengewinde
- **Maximum operating pressure:** 1E+1 Bars
- **Number of ports:** 2
- **Outlet connection size:** 0.5 Inches

## Images

![Flamco Flexvent 1/2" Floatvent c/w shut-off valve - Automatic Air Vent 27740 - Image 1](https://images-na.ssl-images-amazon.com/images/G/01/x-locale/common/grey-pixel.gif)

## Available Options

This product comes in different **Colour Name, Size Name** options.

## Questions & Answers

**Q: Hello - does this connect directly to 15mm copper pipe or does it need an adaptor?**
A: Hi, it has a 1/2" BSP male thread, so you would need an adaptor to fit it onto 15mm copper.

**Q: Can I screw this straight into the top of my towel rail replacing the manual bleed valve? Will I need ptfe tape?**
A: This type of valve isn't really designed for what you are proposing, more to remove air from whole systems. You may wish to consider one of the smaller valves specifically designed for radiators. Try "Aladdin Micro Barlo 6mm Fully Automatic Self Bleeding Radiator Valve" or perhaps have a chat with your local plumbers' merchant.

**Q: what is the Product Dimensions?**
A: Flexvent Dimensions
Ø [mm]: 30
H. [mm]: 75.5

Connection
R 1⁄2"

**Q: Does the valve need to be fitted vertically**
A: As the CH water lifts a plunger against gravity, if the valve was other than upright, it may not operate to its full capacity

## Customer Reviews

### ⭐⭐⭐⭐⭐ Does exactly what it says on the box
*by L***G on 4 October 2020*

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.

### ⭐⭐⭐⭐⭐ Good quality
*by R***A on 5 April 2025*

Great

### ⭐⭐⭐⭐ It's 1/2 inch and comes with a closure valve.
*by M***F on 21 December 2019*

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.

## Frequently Bought Together

- Flamco Flexvent 1/2" Floatvent c/w shut-off valve - Automatic Air Vent 27740
- LOCTITE 55 Pipe Thread Sealant, Non Curing Thread Sealant for Plumbing Pipes and Fittings, Reliable Fast Action Pipe Sealant for Metal and Plastic, 50m

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-01-22*