---
product_id: 381850933
title: "12mm John Guest Inserts (Pack of 50)"
brand: "john guest"
price: "R525"
currency: ZAR
in_stock: true
reviews_count: 8
category: "John Guest"
url: https://www.desertcart.co.za/products/381850933-12mm-john-guest-inserts-pack-of-50
store_origin: ZA
region: South Africa
---

# 12mm O/D semi-rigid pipe fit Pack of 50 inserts for bulk reliability Safe for hot & cold pipework 12mm John Guest Inserts (Pack of 50)

**Brand:** john guest
**Price:** R525
**Availability:** ✅ In Stock

## Summary

> 🔩 Upgrade your plumbing game with pro-grade inserts that keep leaks out and confidence in.

## Quick Answers

- **What is this?** 12mm John Guest Inserts (Pack of 50) by john guest
- **How much does it cost?** R525 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/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

- • **Durable Brass Construction:** Premium brass material guarantees long-lasting strength and corrosion resistance, even under extreme temperatures.
- • **Precision Fit for 12mm Pipes:** Engineered to perfectly reinforce 12mm outer diameter semi-rigid water pipes, ensuring leak-proof joints every time.
- • **Easy Installation, Zero Hassle:** Smooth insertion reduces pipe end deformation and compensates for imperfect cuts, saving you time and frustration.
- • **Bulk Pack for Pro-Level Projects:** 50 inserts per pack means you’re always ready to tackle large-scale plumbing jobs without running out mid-project.
- • **Universal Hot & Cold Compatibility:** Designed to perform flawlessly on both hot and cold water systems, giving you versatile, worry-free installation.

## Overview

The 12mm John Guest Inserts (Pack of 50) are precision-engineered brass fittings designed to reinforce semi-rigid 12mm outer diameter water pipes. Suitable for both hot and cold applications, these inserts prevent leaks by strengthening pipe ends and compensating for imperfect cuts. Ideal for professional and DIY plumbing projects, this bulk pack ensures durability, reliability, and easy installation.

## 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 | 1,528 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 (134) |
| 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/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.co.za/products/381850933-12mm-john-guest-inserts-pack-of-50](https://www.desertcart.co.za/products/381850933-12mm-john-guest-inserts-pack-of-50)

---

*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-22*