---
product_id: 381850933
title: "12mm John Guest Inserts (Pack of 50)"
brand: "john guest"
price: "NT$1119"
currency: TWD
in_stock: true
url: https://www.desertcart.tw/products/381850933-12mm-john-guest-inserts-pack-of-50
store_origin: TW
region: Taiwan
---

# 12mm O/Dia precision fit Pack of 50 for bulk efficiency Hot & cold pipe compatible 12mm John Guest Inserts (Pack of 50)

**Brand:** john guest
**Price:** NT$1119
**Availability:** ✅ In Stock

## Summary

> 🔩 Lock in Leak-Free Confidence with John Guest Inserts!

## Quick Answers

- **What is this?** 12mm John Guest Inserts (Pack of 50) by john guest
- **How much does it cost?** NT$1119 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/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

- • **Precision 12mm Fit:** Engineered for seamless integration with 12mm semi-rigid water pipes, ensuring a flawless connection every time.
- • **Bulk Pack Advantage:** 50 inserts per pack to keep your projects moving without constant reordering—perfect for professionals and DIY enthusiasts alike.
- • **Lightweight & Durable:** At just 30g per pack, these brass inserts combine strength with ease of handling for efficient installation.
- • **Versatile Temperature Range:** Designed to perform reliably on both hot and cold pipework, giving you flexibility across applications.
- • **Leak-Resistant Reinforcement:** Brass inserts strengthen pipe ends, dramatically reducing the risk of leaks and costly downtime.

## Overview

John Guest 12mm brass inserts (pack of 50) are precision-engineered to reinforce semi-rigid water pipes, reducing leaks and ensuring durable connections. Compatible with hot and cold pipework, these lightweight inserts offer professional-grade reliability for plumbing projects.

## Description

12mm John Guest Inserts (Pack of 50)

## 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 |
|---------------|-------|
| Manufacturer | John Guest |
| Product Dimensions | 12 x 12 x 4.5 cm; 30 g |
| Size | 12mm |
| Colour | White |
| Material | Brass |
| Number of Pieces | 50 |
| Batteries included? | No |
| Batteries Required? | No |
| Item Weight | 30 g |

## Product Details

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

## Images

![12mm John Guest Inserts (Pack of 50) - Image 1](https://m.media-amazon.com/images/I/41QsWzsJFZL._AC_UL320_.jpg)
![12mm John Guest Inserts (Pack of 50) - Image 2](https://m.media-amazon.com/images/I/41QsWzsJFZL._AC_UL480_FMwebp_QL65_.jpg)
![12mm John Guest Inserts (Pack of 50) - Image 3](https://m.media-amazon.com/images/I/41QsWzsJFZL._AC_UL640_FMwebp_QL65_.jpg)
![12mm John Guest Inserts (Pack of 50) - Image 4](https://m.media-amazon.com/images/I/41QsWzsJFZL._AC_UL800_FMwebp_QL65_.jpg)
![12mm John Guest Inserts (Pack of 50) - Image 5](https://m.media-amazon.com/images/I/41QsWzsJFZL._AC_UL960_FMwebp_QL65_.jpg)

## 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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---

*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-01-24*