---
product_id: 381850933
title: "12mm John Guest Inserts (Pack of 50)"
brand: "john guest"
price: "€ 31.58"
currency: EUR
in_stock: true
reviews_count: 8
category: "John Guest"
url: https://www.desertcart.fi/products/381850933-12mm-john-guest-inserts-pack-of-50
store_origin: FI
region: Finland
---

# Precise 12mm O/D fit Hot & cold pipe compatible Pack of 50 for bulk reliability 12mm John Guest Inserts (Pack of 50)

**Brand:** john guest
**Price:** € 31.58
**Availability:** ✅ In Stock

## Summary

> 🔩 Upgrade your plumbing game—because leaks are so last season!

## Quick Answers

- **What is this?** 12mm John Guest Inserts (Pack of 50) by john guest
- **How much does it cost?** € 31.58 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/381850933-12mm-john-guest-inserts-pack-of-50)

## 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

- • **Built to Last:** Brass material strengthens pipe ends, drastically reducing leaks
- • **Bulk Pack Advantage:** 50 inserts per pack—ideal for professional projects or future-proofing
- • **Effortless Installation:** Easy to fit even on imperfect pipe cuts, saving time and hassle
- • **Engineered for Precision:** Exact 12mm outer diameter ensures seamless pipe integration
- • **Versatile Temperature Range:** Safe for both hot and cold water systems, no compromises

## Overview

The 12mm John Guest Inserts (Pack of 50) are precision-engineered brass fittings designed to reinforce 12mm semi-rigid water pipes. Compatible with both hot and cold water systems, these inserts prevent leaks by strengthening pipe ends and accommodate slight imperfections in pipe cuts. Ideal for professionals and DIY enthusiasts alike, this bulk pack ensures reliability and longevity in plumbing installations.

## Description

Shop 12mm John Guest Inserts (Pack of 50). Free delivery on eligible orders of £20 or more.

Review: Improves reliability and longevity of 12mm push fit pipes - I use these on the ends of 12mm push fit pipes for both hot and cold. They’re recommended for hot but they’re so cheap, why not use them for cold too ? Easy to fit and they resolve any issues where the pipe isn’t cut 100% straight.
Review: John quest - Received with thanks I can now go to replace the pipe work on our caravan now I have been putting off for a while very pleased great quality and will be ordering more items soon

## Features

- Pack of 50 Inserts for 12mm O/Dia semi-rigid water pipe
- The outside diameter of the insert is 9mm
- These strengthen the end of the pipe reducing the possibility of leaking joints
- Can be used on hot or cold pipework

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09LHRWNVF |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 1,339 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 12 in Pipe Fittings |
| Colour | White |
| Customer Reviews | 4.7 4.7 out of 5 stars (133) |
| Date First Available | 10 Nov. 2021 |
| Item Weight | 40 g |
| Manufacturer | John Guest |
| Material | Brass |
| Number of Pieces | 50 |
| Product Dimensions | 12 x 12 x 4.5 cm; 40 g |
| Size | 12mm |

## Product Details

- **Brand:** John Guest
- **Colour:** White
- **Connector type:** Insert
- **Item dimensions L x W x H:** 12 x 12 x 4.5 centimetres
- **Manufacturer:** John Guest
- **Material:** Brass
- **Number of pieces:** 50
- **Size:** 12mm
- **Thread size:** 3/8 inch
- **Thread type:** UN

## Images

![12mm John Guest Inserts (Pack of 50) - Image 1](https://m.media-amazon.com/images/I/212HM3OdpGL.jpg)
![12mm John Guest Inserts (Pack of 50) - Image 2](https://m.media-amazon.com/images/I/217nRfhaZTL.jpg)
![12mm John Guest Inserts (Pack of 50) - Image 3](https://m.media-amazon.com/images/I/41HrjY9k-YL.jpg)
![12mm John Guest Inserts (Pack of 50) - Image 4](https://m.media-amazon.com/images/I/41QsWzsJFZL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Improves reliability and longevity of 12mm push fit pipes
*by D***W on 27 April 2025*

I use these on the ends of 12mm push fit pipes for both hot and cold. They’re recommended for hot but they’re so cheap, why not use them for cold too ? Easy to fit and they resolve any issues where the pipe isn’t cut 100% straight.

### ⭐⭐⭐⭐⭐ John quest
*by D***E on 14 September 2025*

Received with thanks I can now go to replace the pipe work on our caravan now I have been putting off for a while very pleased great quality and will be ordering more items soon

### ⭐⭐⭐⭐ Pipe plug
*by A***R on 5 April 2025*

Did the job purchased for with ease

## Frequently Bought Together

- 12mm John Guest Inserts (Pack of 50)
- John Guest 12mm Equal Elbow Push Fit Pipe Water Fitting Connector **4 Pack**
- John Guest PP Shut Off Valve Connection 12 mm (One Supplied)

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**Shop now:** [https://www.desertcart.fi/products/381850933-12mm-john-guest-inserts-pack-of-50](https://www.desertcart.fi/products/381850933-12mm-john-guest-inserts-pack-of-50)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-11*