---
product_id: 10542980
title: "John Guest 3/8 Inch O.D. Tube Size x 1/4 Inch NPTF Speedfit to Female Shut Off Valve, Push to Connect Plastic Plumbing Fitting, PPSV501222WP"
brand: "john guest"
price: "30579CFA"
currency: XOF
in_stock: true
reviews_count: 13
category: "John Guest"
url: https://www.desertcart.sn/products/10542980-john-guest-3-8-inch-o-d-tube-size-x
store_origin: SN
region: Senegal
---

# Food-grade EPDM O-rings Tool-free twist-lock install 150 PSI durable pressure rating John Guest 3/8 Inch O.D. Tube Size x 1/4 Inch NPTF Speedfit to Female Shut Off Valve, Push to Connect Plastic Plumbing Fitting, PPSV501222WP

**Brand:** john guest
**Price:** 30579CFA
**Availability:** ✅ In Stock

## Summary

> 🚿 Upgrade your plumbing game with leak-free confidence!

## Quick Answers

- **What is this?** John Guest 3/8 Inch O.D. Tube Size x 1/4 Inch NPTF Speedfit to Female Shut Off Valve, Push to Connect Plastic Plumbing Fitting, PPSV501222WP by john guest
- **How much does it cost?** 30579CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/10542980-john-guest-3-8-inch-o-d-tube-size-x)

## 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

- • **Premium Material Build:** Made from high-grade polypropylene with chemical-resistant, non-toxic components.
- • **Effortless Installation:** Twist-and-lock design means zero tools, glue, or soldering—get it done in seconds.
- • **Perfect Fit for RO Systems:** Specifically sized for 3/8 inch tubing and 1/4 inch NPTF connections—no more guesswork.
- • **Pressure-Ready Performance:** Handles up to 150 PSI at 70°F and 60 PSI at 140°F—built for demanding plumbing needs.
- • **Certified Safety & Durability:** FDA-compliant, NSF 61 & 51 certified for potable water—trusted behind-the-wall reliability.

## Overview

The John Guest 3/8 Inch O.D. Tube x 1/4 Inch NPTF Speedfit Female Shut-Off Valve is a high-quality, tool-free push-to-connect fitting made from durable polypropylene. Featuring food-grade EPDM O-rings and certified for potable water use, it offers a secure, leak-free connection rated for up to 150 PSI. Ideal for behind-the-wall installations and RO water systems, it combines professional-grade reliability with effortless installation.

## Description

Product Description Simplify your plumbing projects with the John Guest female shut-off valve. Made from polypropylene, this push-to-connect fitting requires no tools or glue for a secure, leak-free connection. This plumbing shut-off valve is fitted with food-grade EPDM O-rings and is FDA-compliant. These safe and durable shut-off valves are approved for behind-the-wall applications as a permanent leak-free connection and are certified for use in potable water and hydronic heating system applications. John Guest plastic push female angle shut-off valves are rated at 150 PSI at 70 degrees Fahrenheit and 60 PSI at 140 degrees Fahrenheit. From the Manufacturer JG Speedfit is the easy to use, plastic push-fit system suitable for the plumbing of hot and cold water services and heating applications.

Review: Well made RO water tank valve. - Simple tank valve. Appears well made, fitted my RO tank perfectly and easy to install.
Review: Fits perfectly on top of RO tank. Size and type matter. - It took me a couple orders before I found this one. There are multiple types and sizes of these. The output is 3/8 here, which is the thicker RO tubing. Some of these valves are only 1/4 output, which fit the thin tubes, so best to check the type of tubes in use on your system here. The other end, the end that fits onto the RO tank-- NPTF is the twist on type. They make multiple sizes of this and despite thinking I needed 3/8 on the bottom, 1/4 NPTF seems to be the more common RO sizing. Use a little plumbers tape on the twist on to ensure a smooth/leak free connection. Screw on by hand as tight as you can possibly get it to go. No leaks yet on two of these. The valve does its job. The price on this is a bit steep for what should be a $3 part, but it works perfect and is the only one out there it seems.

## Features

- JOHN GUEST FEMALE SHUT-OFF VALVE: This John Guest female shut-off valve is manufactured in white polypropylene and fitted with food-grade EPDM O-rings; suitable for use with 3/8 inch plastic or soft copper tubing
- EASY TO INSTALL: The twist-and-lock feature of this female angle shut-off valve allows for quick and easy installation, with no tools, crimping, glue, or soldering required
- SAFE, DURABLE, AND HIGH QUALITY: This female shut-off valve is durable and non-toxic; provides excellent chemical resistance; FDA-compliant and NSF 61 and 51 certified
- PREFERRED BY THE PRO: These shut-off valves are for use with potable water; approved for behind-the-wall applications as a permanent leak-free connection
- SPECS: John Guest plastic shut-off valve fittings are rated at 150 PSI at 70 degrees Fahrenheit and 60 PSI at 140 degrees Fahrenheit

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B003YKF2GU |
| Best Sellers Rank | #27,770 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #798 in Pipe Fittings |
| Brand | John Guest |
| Brand Name | John Guest |
| Connector Type | Shut-Off Valve |
| Customer Reviews | 4.6 out of 5 stars 860 Reviews |
| Exterior Finish | Plastic |
| Global Trade Identification Number | 00665626120015 |
| Included Components | Valve |
| Inlet Connection Size | 0.38 Inches |
| Inlet Connection Type | National Pipe Tapered |
| Item Dimensions | 11 x 10 x 4 inches |
| Item Type Name | Push-Fit Elbow Shut-Off Valve |
| Item Weight | 5 Grams |
| Item dimensions L x W x H | 11 x 10 x 4 inches |
| Manufacturer | John Guest Speedfit |
| Manufacturer Part Number | PPSV501222WP |
| Manufacturer Warranty Description | 25 Years |
| Material | Plastic |
| Material Type | Plastic |
| Maximum Pressure | 150 Pound per Square Inch |
| Model Number | PPSV501222WP |
| Number of Pieces | 1 |
| Number of Ports | 1 |
| Outlet Connection Size | 0.38 Inches |
| Size | 3/8 in. OD x 1/4 in. NPTF |
| Specification Met | NSF 61, NSF 51 |
| Thread Size | 0.25 inch |
| Thread Type | NPTF |
| UPC | 665626120015 |
| Unit Count | 1.0 Count |
| Valve Type | Shut-Off Valve |

## Product Details

- **Brand:** John Guest
- **Exterior Finish:** Plastic
- **Inlet Connection Size:** 0.38 Inches
- **Inlet Connection Type:** National Pipe Tapered
- **Item dimensions L x W x H:** 11 x 10 x 4 inches
- **Material:** Plastic
- **Maximum Operating Pressure:** 150 Pound per Square Inch
- **Number of Ports:** 1
- **Outlet Connection Size:** 0.38 Inches
- **Specification Met:** NSF 61, NSF 51

## Images

![John Guest 3/8 Inch O.D. Tube Size x 1/4 Inch NPTF Speedfit to Female Shut Off Valve, Push to Connect Plastic Plumbing Fitting, PPSV501222WP - Image 1](https://m.media-amazon.com/images/I/61Y0vnoABIL.jpg)

## Available Options

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

## Questions & Answers

**Q: Cant find the right size! i need the threaded female end to be 3/8 npt and the tube end 1/4 od. can anyone help?**
A: This may or may not help you. But all tanks that have a small threaded outlet are 1/4" if you measure it it will actually measure close to 3/8 but they call it 1/4NPT. As far as I know they do not make a tank shutoff with 3/8NPT threads

**Q: So the outlet of this valve is a 1/4" id and 3/8" od correct?  So 1/4" pex will fit in the outlet as a press fit?**
A: No.  Pex is considered as the same size as copper. 1/4 pex is equal to 5/16" OD or 1/4 CTS

**Q: wjhich way does the valve point when in the on position?**
A: When the valve is open the blue tab is pointing to the fitting on the side, when closed it is 90 degrees to the fitting.

**Q: Will this work on a pureblueh2o tank? the tank looks similar with a 1/4" thread. that system uses a compression nut which is flimsy and leak-prone.**
A: These are classified as universal

## Customer Reviews

### ⭐⭐⭐⭐⭐ Well made RO water tank valve.
*by K***W on January 30, 2026*

Simple tank valve. Appears well made, fitted my RO tank perfectly and easy to install.

### ⭐⭐⭐⭐⭐ Fits perfectly on top of RO tank. Size and type matter.
*by M***O on November 19, 2024*

It took me a couple orders before I found this one. There are multiple types and sizes of these. The output is 3/8 here, which is the thicker RO tubing. Some of these valves are only 1/4 output, which fit the thin tubes, so best to check the type of tubes in use on your system here. The other end, the end that fits onto the RO tank-- NPTF is the twist on type. They make multiple sizes of this and despite thinking I needed 3/8 on the bottom, 1/4 NPTF seems to be the more common RO sizing. Use a little plumbers tape on the twist on to ensure a smooth/leak free connection. Screw on by hand as tight as you can possibly get it to go. No leaks yet on two of these. The valve does its job. The price on this is a bit steep for what should be a $3 part, but it works perfect and is the only one out there it seems.

### ⭐⭐⭐⭐⭐ This is the one you want - don’t buy the cheaper knockoff
*by H***Y on November 9, 2024*

If you need a 3/8” quick connect (push in) water tank valve for your RO line, this is the one you need. I bought a cheaper version about 6 months ago to add a 2nd tank to my RO system. About 4 months later, my wife saw water dripping from the kitchen sink cabinet. The issue was the tank valve I had purchased earlier. The base of the valve that screws onto the tank nipple had split. I was getting a slow but consistent drip from the valve and it ended up ruining the bottom of the cabinet from water damage. I ordered this replacement and it’s clearly made by people who know what they are doing. The base of this valve is reinforced by a brass ring to prevent the plastic from cracking. Works like a charm and I am confident this piece will not fail over time. Spend the extra few dollars to get one that will last.

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*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-06-03*