---
product_id: 13386715
title: "John Guest Acetal Copolymer Tube Fitting, Union Straight Connector, 1/4\" Tube OD (Pack of 10)"
brand: "john guest"
price: "€ 59.76"
currency: EUR
in_stock: true
reviews_count: 10
category: "John Guest"
url: https://www.desertcart.sk/products/13386715-john-guest-acetal-copolymer-tube-fitting-union-straight-connector-1
store_origin: SK
region: Slovakia
---

# High tensile & flexural strength Push-to-connect ease NSF/ANSI certified for potable water John Guest Acetal Copolymer Tube Fitting, Union Straight Connector, 1/4" Tube OD (Pack of 10)

**Brand:** john guest
**Price:** € 59.76
**Availability:** ✅ In Stock

## Summary

> 🔧 Connect with confidence—where durability meets simplicity!

## Quick Answers

- **What is this?** John Guest Acetal Copolymer Tube Fitting, Union Straight Connector, 1/4" Tube OD (Pack of 10) by john guest
- **How much does it cost?** € 59.76 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/13386715-john-guest-acetal-copolymer-tube-fitting-union-straight-connector-1)

## 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 Endure:** Crafted from acetal copolymer for superior strength and fatigue resistance under pressure.
- • **Universal Compatibility:** Seamlessly accepts nylon, soft nylon, and polyurethane tubing for versatile use.
- • **Certified Safety & Quality:** Meets NSF/ANSI 14, 51, and 61 standards—trusted for drinking water systems.
- • **Pressure-Ready Performance:** Handles up to 150 psi, ensuring reliable operation in demanding environments.
- • **Effortless Inline Connection:** Push-to-connect design lets you join pipes in seconds—no tools, no hassle.

## Overview

The John Guest Acetal Copolymer Union Straight Connector is a high-performance, push-to-connect fitting designed for quick and secure inline pipe connections. Made from durable acetal copolymer, it offers low moisture absorption, exceptional tensile and flexural strength, and fatigue resistance. Compatible with nylon and polyurethane tubing, it supports working pressures up to 150 psi and meets rigorous NSF/ANSI standards for potable water safety, making it an ideal choice for professional-grade plumbing applications.

## Description

This John Guest union straight connector fitting is made of acetal copolymer and has tube connectors. This union straight connector fitting is for connecting and disconnecting two inline pipes more easily than using couplings. It is a push-to-connect fitting that accepts the insertion of nylon, soft nylon and polyurethane tube fittings. It is made of acetal copolymer plastic, which has low moisture absorption, high tensile and flexural strength, and is hard and fatigue resistant. The working pressure for this fitting is up to 150 pounds per square inch (psi). This fitting meets National Sanitation Foundation (NSF)/American National Standards Institute (ANSI) standards 14, 51, and 61 for plastic piping systems, food equipment materials, and use with drinking (potable) water.Pipe fittings are components used for connecting, terminating, controlling flow, and changing the direction of piping in many different industries. Push-to-connect compression fittings do not require tools or sealants, and are useful in installations where a heat source, such as a soldering torch, is prohibited. When purchasing pipe fittings, consider the application, as this will affect material type, shape, size, and required durability. Fittings are available threaded or unthreaded, in many shapes, styles, sizes, and schedules (pipe wall thickness).John Guest manufactures push-to-connect fittings and pipe and plastic plumbing systems. The company, founded in 1961, is headquartered in Great Britain and meets International Organization for Standardization (ISO) standard 9001.

Review: Perfect solution - Perfect ... exactly what I needed and they are great couplers.
Review: Recommend - It worked well on my refrigerator pipe.

## Features

- Union straight connector for connecting and disconnecting two inline pipes 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B005XTZXJG |
| Best Sellers Rank | #77,322 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2,299 in Pipe Fittings |
| Brand | John Guest |
| Color | White |
| Connector Type | Union |
| Date First Available | May 25, 2010 |
| Global Trade Identification Number | 00665626047664 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.41 ounces |
| Item dimensions L x W x H | 0.59 x 0.59 x 1.5 inches |
| Item model number | PI0408S |
| Manufacturer | John Guest |
| Material | Acetal |
| Number of Pieces | 1 |
| Product Dimensions | 0.59 x 0.59 x 1.5 inches |
| Size | 1/4" Tube OD |
| Thread Type | NPT |
| UPC | 665626047664 |

## Product Details

- **Brand:** John Guest
- **Color:** White
- **Connector Type:** Union
- **Global Trade Identification Number:** 00665626047664
- **Item Weight:** 0.04 Kilograms
- **Item dimensions L x W x H:** 0.59 x 0.59 x 1.5 inches
- **Material:** Acetal
- **Number of Pieces:** 1
- **Size:** 1/4" Tube OD
- **Thread Type:** NPT

## Images

![John Guest Acetal Copolymer Tube Fitting, Union Straight Connector, 1/4" Tube OD (Pack of 10) - Image 1](https://m.media-amazon.com/images/I/316TvByJVsL.jpg)
![John Guest Acetal Copolymer Tube Fitting, Union Straight Connector, 1/4" Tube OD (Pack of 10) - Image 2](https://m.media-amazon.com/images/I/31hm0qFrmoL.jpg)
![John Guest Acetal Copolymer Tube Fitting, Union Straight Connector, 1/4" Tube OD (Pack of 10) - Image 3](https://m.media-amazon.com/images/I/711hm1WYDdL.jpg)
![John Guest Acetal Copolymer Tube Fitting, Union Straight Connector, 1/4" Tube OD (Pack of 10) - Image 4](https://m.media-amazon.com/images/I/71aGjZ-yT8L.jpg)

## Questions & Answers

**Q: Is this a push to connect?**
A: Yes. It is a friction fit. I use the male inserts with barbed ends for tubing. To release, push in on the ring. Sometimes it takes a bit to get it to release. I have used John Guest fittings under pressure and vacuum. You can use rigid wall tubing to accomplish a good fit with same OD,

**Q: I used one to splice together my refrigerator water line tube after I had to remove a leaking section.  But, now I have no water flow.  What''s wrong?**
A: Suggest you remove and check to make sure nothing is blocking connector that would prevent water flow.  While you have the connector off, check to make sure water is flowing from the line ahead of where you placed connector.  Also, blow out the line below where you had connector installed.  Don't know if this will solve your problem but are the steps I would take to repair.

**Q: Is this compatiable with cpvc?**
A: These adapters work by a friction fit against an O-ring. I have used this fitting with Teflon tubing, Tygon with an insert to hold its shape, as well as other John Guest adapters. Assuming no chemical issues here, the question is whether your cpvc tubing is rigid and the correct outer diameter to get a good fit. I have found better, air-tight fits by trying to use just the tubing. The John Guest barbed inserts work with all tubing as long as you make sure to clamp the barb to keep the connection airtight.

**Q: what is the operating temperature?**
A: With a little effort, you can find this yourself.  From the product specs, you can learn that the fitting is qualified under NSF/ANSI standards 14, 51, and 61.  Searching on-line for these ANSI standards reveals in a PDF file the following:
© 2016 NSF 
NSF/ANSI 61 - 2016 17
4.2
  Definitions 
4.2.1   cold water application:
 A product application that is intended to result in continuous exposure to 
water of ambient temperature. Products are tested for an end-use temperature of 23 ± 2°C (73 ± 4°F).
4.2.2  commercial hot water application:
 A product application that is intended to result in continuous 
or intermittent exposure to water that has been raised from ambient temperature. Intermittent exposure is 
defined as any hot water contact that is not continuous. Products are tested for an end-use temperature 
of 82 ± 2°C (180 ± 4°F).
4.2.3 domestic hot water application: 
A product application that is intended to result in continuous or 
intermittent  exposure  to  water  that  has  been  raised  from  ambient  temperature.  Intermittent  exposure  is 
defined as any hot water contact that is not continuous. Products are tested for an end-use temperature 
of 60 ± 2°C (140 ± 4°F)

Thus, the fittings would be expected to qualify for at least those specified temperatures.  Of course, depending on what tubing you are using along with pressure in the lines, your mileage may vary.  

The Amazon description mentions that the fittings are good to 150 psi, but is silent on temperature.   You can further research this to see if you can find a section that specifies max pressure at a given temperature.   I cannot put the link in this message, I don't believe, but search Google on NSF/ANSI 61- 2016 Drinking Water System Components - Health Effects to locate the PDF file.  Then search it for pressure to see if that is listed.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect solution
*by J***N on September 5, 2025*

Perfect ... exactly what I needed and they are great couplers.

### ⭐⭐⭐⭐⭐ Recommend
*by M***Z on September 4, 2025*

It worked well on my refrigerator pipe.

### ⭐⭐⭐⭐⭐ Simple to use and workds perfectly
*by J***K on September 4, 2017*

I had a leaking water line on the back of a refrigerator owing to an otherwise tiny and invisible spit. This tube coupler worked perfectly. I snipped out the bad section and rejoined the ends of the tubing. A process which took only seconds. Works perfectly and better than I expected.

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-01-30*