---
product_id: 514811805
title: "Push Fit Single Check Valve 12mm (12SCV)"
brand: "john guest"
price: "£16.99"
currency: GBP
in_stock: true
reviews_count: 11
category: "John Guest"
url: https://www.desertcart.co.uk/products/514811805-push-fit-single-check-valve-12mm-12scv
store_origin: GB
region: United Kingdom
---

# prevents backflow 12mm precision fit durable brass build Push Fit Single Check Valve 12mm (12SCV)

**Brand:** john guest
**Price:** £16.99
**Availability:** ✅ In Stock

## Summary

> 💧 Keep your water flowing forward—no leaks, no worries!

## Quick Answers

- **What is this?** Push Fit Single Check Valve 12mm (12SCV) by john guest
- **How much does it cost?** £16.99 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/514811805-push-fit-single-check-valve-12mm-12scv)

## Best For

- john guest enthusiasts

## Why This Product

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

## Key Features

- • **Compact & Lightweight:** At just 20g and 6.9cm length, it fits seamlessly into tight plumbing setups without bulk.
- • **Reliable One-Way Flow:** Engineered to prevent backflow, protecting your water heater and system integrity.
- • **Effortless Installation:** Push-fit design means no tools, no hassle—get your system running in seconds.
- • **Trusted Industry Leader:** John Guest quality you can count on—top-ranked and highly rated by professionals.
- • **Premium Brass Construction:** Built to last with corrosion-resistant brass for long-term durability and peace of mind.

## Overview

The John Guest Push Fit Single Check Valve 12mm is a compact, brass non-return valve designed for easy push-fit installation. It ensures one-way water flow, preventing backflow in water heating systems. Lightweight and durable, it’s a top-rated choice trusted by professionals for leak-free performance and long-lasting reliability.

## Description

John Guest Single Check Valve 12mm. also known as a one-way valve or non-return valve. These are used with most water heating systems to prevent water exiting the heaters input line.

Review: Quality you expect from JG Speedfit - Great quality item. Easy to fit, no leaks in my camper pressurised water system.
Review: Does what it’s supposed to - Does exactly what it’s supposed to do. Easy to use and works well

## Features

- John Guest
- 12mm Fitting

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BX6GPBDQ |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 4,789 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 1 in Check Valves |
| Colour | Black |
| Customer Reviews | 4.7 4.7 out of 5 stars (59) |
| Date First Available | 1 Mar. 2023 |
| Included Components | 1 Single Check Valve |
| Item Weight | 20 g |
| Item model number | 12SCV |
| Manufacturer | John Guest |
| Material | Brass |
| Number of Pieces | 1 |
| Product Dimensions | 2.3 x 2.3 x 6.9 cm; 20 g |
| Size | Klein |

## Product Details

- **Brand:** John Guest
- **Colour:** Black
- **Connector type:** Coupling
- **Item dimensions L x W x H:** 23 x 23 x 69 millimetres
- **Item weight:** 20 Grams
- **Material:** Brass
- **Number of pieces:** 1
- **Size:** Klein
- **Thread size:** 1/2 inch
- **Thread type:** UN

## Images

![Push Fit Single Check Valve 12mm (12SCV) - Image 1](https://m.media-amazon.com/images/I/31E-kc-+RJL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Quality you expect from JG Speedfit
*by T***S on 19 August 2025*

Great quality item. Easy to fit, no leaks in my camper pressurised water system.

### ⭐⭐⭐⭐⭐ Does what it’s supposed to
*by M***S on 7 June 2024*

Does exactly what it’s supposed to do. Easy to use and works well

### ⭐⭐⭐⭐⭐ Great quality.
*by K***N on 4 September 2024*

Great quality, perfect for what we required in our campervan conversion. Solar panels now up and running.

## Frequently Bought Together

- John Guest Push Fit Single Check Valve 12mm (12SCV)
- John Guest PP Shut Off Valve Connection 12 mm (One Supplied)
- John Guest 12mm Equal Elbow Push-Fit Pipe Connector – Quick Connect Fitting for Water & Air Systems (Pack of 4)

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**Shop now:** [https://www.desertcart.co.uk/products/514811805-push-fit-single-check-valve-12mm-12scv](https://www.desertcart.co.uk/products/514811805-push-fit-single-check-valve-12mm-12scv)

---

*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-05-18*