---
product_id: 58745756
title: "Flamco Flexvent 3/8\" Floatvent c/w shut-off valve - Automatic Air Vent 27750"
brand: "flamco"
price: "319 kr"
currency: DKK
in_stock: null
reviews_count: 13
category: "Flamco"
url: https://www.desertcart.dk/products/58745756-flamco-flexvent-3-8-floatvent-c-w-shut-off-valve
store_origin: DK
region: Denmark
---

# automatic air bleed valve max 120°C operating temp 3/8 inch brass thread Flamco Flexvent 3/8" Floatvent c/w shut-off valve - Automatic Air Vent 27750

**Brand:** flamco
**Price:** 319 kr
**Availability:** ❌ Out of Stock

## Summary

> 💡 Elevate your heating game with Flamco’s smart, sleek air vent solution!

## Quick Answers

- **What is this?** Flamco Flexvent 3/8" Floatvent c/w shut-off valve - Automatic Air Vent 27750 by flamco
- **How much does it cost?** 319 kr with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/58745756-flamco-flexvent-3-8-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

- • **Effortless Air Removal:** Automatic float valve ensures continuous, maintenance-free air venting
- • **Durability You Can Trust:** Factory-tested quality with dirt-protected seal seat for long-lasting operation
- • **Compact Precision Engineering:** Sleek brass housing fits seamlessly in tight heating systems
- • **Easy Installation & Leak-Free Fit:** 3/8 inch male thread with shut-off valve for quick, secure setup
- • **Reliable High-Pressure Performance:** Operates safely up to 10 bar peak pressure for robust system stability

## Overview

The Flamco Flexvent 3/8" Floatvent with shut-off valve is a compact, brass automatic air vent designed for central heating systems. It features a 3/8 inch male thread, supports operating temperatures up to 120°C and pressures up to 10 bar, and includes a protective chamber to keep the seal seat dirt-free. Factory-tested for quality, it ensures reliable, maintenance-free air bleeding to optimize system efficiency and longevity.

## Description

Free delivery and returns on all eligible orders. Shop Flamco Flexvent 3/8" Floatvent c/w shut-off valve - Automatic Air Vent 27750.

Review: 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.
Review: Good quality - Great

## Features

- Automatic bleed valve with very compact br housing and 3/8 inch male thread.
- The T-Plus is the perfect solution for setting up branches or other changes to operational structures.
- Thanks to its extremely compact shape, the Flamco Flexvent 3/8 inch valve can be easily installed in any system that can be installed at a temperature below 90°C (with a tip of max. 120°C) and a pressure of 6 bar (with a peak of max. 10 bar).
- As a quality , 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 |
|---------------|-------|
| ASIN | B0042ZQGKM |
| Best Sellers Rank | 151,823 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,320 in Central Heating System Accessories |
| Brand | Flamco |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,217) |
| Exterior Finish | Brass |
| Inlet Connection Size | 0.38 Inches |
| Inlet Connection Type | Brass |
| Item Dimensions | 23 x 3 x 80 centimetres |
| Item Weight | 0.01 Kilograms |
| Manufacturer | Flamco |
| Material | Brass |
| Maximum Pressure | 10 Bars |
| Model Number | 27750 |
| Number of Ports | 2 |
| Outlet Connection Size | 9.53 Millimeters |
| Outlet Connection Type | NPT |
| Size | R 3⁄8" |
| Specification Met | DIN |
| Thread Size | 3/8 duim |
| Thread Type | M (Manufacturer |
| Unit Count | 1.0 count |
| Valve Type | Float Valve |

## Product Details

- **Brand:** Flamco
- **Exterior finish:** Brass
- **Inlet connection size:** 0.38 Inches
- **Inlet connection type:** Brass
- **Item dimensions L x W x H:** 23 x 3 x 80 centimetres
- **Material:** Brass
- **Maximum operating pressure:** 10 Bars
- **Number of ports:** 2
- **Outlet connection size:** 9.53 Millimeters
- **Outlet connection type:** NPT

## Images

![Flamco Flexvent 3/8" Floatvent c/w shut-off valve - Automatic Air Vent 27750 - Image 1](https://m.media-amazon.com/images/I/712Kkf4x-aL.jpg)
![Flamco Flexvent 3/8" Floatvent c/w shut-off valve - Automatic Air Vent 27750 - Image 2](https://m.media-amazon.com/images/I/71KiPVoYSmL.jpg)
![Flamco Flexvent 3/8" Floatvent c/w shut-off valve - Automatic Air Vent 27750 - Image 3](https://m.media-amazon.com/images/I/71nYqmV8-gL.jpg)
![Flamco Flexvent 3/8" Floatvent c/w shut-off valve - Automatic Air Vent 27750 - Image 4](https://m.media-amazon.com/images/I/71kukjB-eUL.jpg)
![Flamco Flexvent 3/8" Floatvent c/w shut-off valve - Automatic Air Vent 27750 - Image 5](https://m.media-amazon.com/images/I/71xPP+-LqEL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Questions & Answers

**Q: do you have to drain down hot water tank to fit this valve which is replacing a blown one of the same please**
A: It all depends on your system and why / where the valve is installed etc. On my system it was (almost) at the top of the central heating radiator circuit and was completely separate from the hot water storage tank. I just needed to turn off the water supply and electric then drain sufficient water from the radiator loop so the water level and pressure fell sufficiently to allow me to safely replace the valve. I then had to restore the water level and bleed the system etc. Your central heating system is probably very different from mine, so this may not apply in your case.  Irrespective of where ithe valve is located in the circuit you will definitely need to at least partially drain your system as the valve is intended to operate under pressure. If in doubt, consult a plumber.

## 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 3/8" Floatvent c/w shut-off valve - Automatic Air Vent 27750
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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-04-24*