---
product_id: 58745756
title: "Flexvent 3/8"
brand: "flamco"
price: "RM207"
currency: MYR
in_stock: null
reviews_count: 13
category: "Flamco"
url: https://www.desertcart.com.my/products/58745756-flexvent-3-8
store_origin: MY
region: Malaysia
---

# Withstands pressure up to 10 bar peak Operates safely up to 90°C (peak 120°C) 3/8 inch male thread for seamless integration Flexvent 3/8

**Brand:** flamco
**Price:** RM207
**Availability:** ❌ Out of Stock

## Summary

> 🔥 Keep your heating system flawless with Flamco Flexvent – the smart valve for pros who settle for nothing less!

## Quick Answers

- **What is this?** Flexvent 3/8 by flamco
- **How much does it cost?** RM207 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.my](https://www.desertcart.com.my/products/58745756-flexvent-3-8)

## 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

- • **Built to Last:** Durable brass construction ensures leak-free, long-term performance over plastic alternatives.
- • **Compact Powerhouse:** Ultra-compact design fits effortlessly into any heating system setup.
- • **Effortless Installation:** 3/8 inch male thread and protective chamber design simplify fitting and maintenance.
- • **Precision Air Management:** Automatic float vent with shut-off valve optimizes system efficiency by eliminating trapped air.
- • **Tested Quality Assurance:** Every unit factory-tested to guarantee flawless operation from day one.

## 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, operates safely up to 90°C (peak 120°C), and withstands pressures up to 10 bar (peak 10 bar). Factory-tested for quality, it prevents airlocks by automatically bleeding trapped air, improving system efficiency and reliability. Its robust build and easy installation make it a superior replacement for plastic valves.

## 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 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 48,756 in DIY & Tools ( See Top 100 in DIY & Tools ) 521 in Central Heating System Accessories |
| Certification | DIN |
| Colour | Brass |
| Customer Reviews | 4.4 4.4 out of 5 stars (1,195) |
| Date First Available | 12 Oct. 2010 |
| Item Package Quantity | 1 |
| Item Weight | 10 g |
| Item model number | 27750 |
| Manufacturer | Flamco |
| Material | Brass |
| Maximum Pressure | 10 Bars |
| Part Number | 27750 |
| Power Source | Wired |
| Product Dimensions | 23 x 3 x 80 cm; 10 g |
| Size | R 3⁄8" |
| Special Features | Energy Efficient |

## 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

![Flexvent 3/8 - Image 1](https://m.media-amazon.com/images/I/31fLEN86nLL.jpg)
![Flexvent 3/8 - Image 2](https://m.media-amazon.com/images/I/31lxtwl9L1L.jpg)
![Flexvent 3/8 - Image 3](https://m.media-amazon.com/images/I/31sAUuUCuOL.jpg)
![Flexvent 3/8 - Image 4](https://m.media-amazon.com/images/I/411U1lrvGvL.jpg)
![Flexvent 3/8 - Image 5](https://m.media-amazon.com/images/I/41AXf-mN38L.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
- LOCTITE 55, Thread Sealing Thread for Quick Seal, Thread Seal for Pipe Threads and Fittings, for Threads Made of Metal and Plastic, 1 x 160 m
- Variosan Automatic Quick Release Vent In Polished Brass, Thin Shape, With Mounting Valve 1.3 cm (1/2 ")

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*Product available on Desertcart Malaysia*
*Store origin: MY*
*Last updated: 2026-03-10*