---
product_id: 26017694
title: "John GuestAcetal Copolymer Tube Fitting, Reducing Straight Union, 3/8\" x 5/16\" Tube OD (Pack of 10)"
brand: "john guest"
price: "€ 79.28"
currency: EUR
in_stock: true
reviews_count: 13
url: https://www.desertcart.hr/products/26017694-john-guestacetal-copolymer-tube-fitting-reducing-straight-union-3-8
store_origin: HR
region: Croatia
---

# Low moisture absorption Reducing union 150 psi pressure John GuestAcetal Copolymer Tube Fitting, Reducing Straight Union, 3/8" x 5/16" Tube OD (Pack of 10)

**Brand:** john guest
**Price:** € 79.28
**Availability:** ✅ In Stock

## Summary

> 🔧 Connect with Confidence!

## Quick Answers

- **What is this?** John GuestAcetal Copolymer Tube Fitting, Reducing Straight Union, 3/8" x 5/16" Tube OD (Pack of 10) by john guest
- **How much does it cost?** € 79.28 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/26017694-john-guestacetal-copolymer-tube-fitting-reducing-straight-union-3-8)

## 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 Design:** Crafted from acetal copolymer for superior strength and longevity.
- • **Certified Quality:** Meets stringent NSF/ANSI standards for peace of mind.
- • **Moisture Resistant:** Engineered to absorb minimal moisture, ensuring reliability.
- • **Seamless Connections:** Effortlessly connect and disconnect inline pipes of varying diameters.
- • **High Pressure Tolerance:** Handles working pressures up to 150 psi with ease.

## Overview

The John Guest Acetal Copolymer Tube Fitting is a versatile reducing straight union designed for seamless connections between inline pipes of different diameters. Made from durable acetal copolymer plastic, it boasts low moisture absorption and high tensile strength, making it ideal for various applications. With a working pressure of up to 150 psi and compliance with NSF/ANSI standards, this pack of 10 fittings ensures quality and reliability for your plumbing needs.

## Description

John GuestAcetal Copolymer Tube Fitting, Reducing Straight Union, 3/8" x 5/16" Tube OD (Pack of 10)

## Features

- Reducing straight union for connecting and disconnecting two inline pipes of different diameters more easily than couplings
- Accepts nylon and polyurethane tube fittings
- Made of acetal copolymer plastic for low moisture absorption and high tensile and flexural strength
- Working pressure of up to 150 psi
- Meets NSF/ANSI standards 14, 51, and 61 for quality assurance

## Images

![John GuestAcetal Copolymer Tube Fitting, Reducing Straight Union, 3/8" x 5/16" Tube OD (Pack of 10) - Image 1](https://m.media-amazon.com/images/I/61Ij-8bJDjL.jpg)
![John GuestAcetal Copolymer Tube Fitting, Reducing Straight Union, 3/8" x 5/16" Tube OD (Pack of 10) - Image 2](https://m.media-amazon.com/images/I/71J7-McdXrL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Hard to Find Size - Great Price
  

*by W***A on Reviewed in the United States on June 8, 2017*

Excellent value for a really hard to find size of Quick Connect. Many refrigerators with water and ice in the door have a little Quick Connect where the door connects to the fridge. If you ever have to remove your door to move the fridge in and out of the house or if the Quick Connect fails good luck trying to find this size Quick Connect. The appliance places want about $7 a piece for these and they have to order them. Replacement of the damaged Quick Connect took just a couple seconds and it works perfectly.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Five Stars
  

*by L***A on Reviewed in the United States on May 9, 2018*

Works great

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Well made & will buy again!
  

*by M***R on Reviewed in the United States on July 22, 2017*

These fittings seem well made and the price is right. I haven't had any trouble with them. No leaking problems. An easy 5 stars

---

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**Shop now:** [https://www.desertcart.hr/products/26017694-john-guestacetal-copolymer-tube-fitting-reducing-straight-union-3-8](https://www.desertcart.hr/products/26017694-john-guestacetal-copolymer-tube-fitting-reducing-straight-union-3-8)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-07-10*