---
product_id: 511717144
title: "3/8\" tube O.D. check valve"
brand: "eshiong"
price: "$701"
currency: MXN
in_stock: null
reviews_count: 13
category: "Eshiong"
url: https://www.desertcart.mx/products/511717144-3-8-tube-o-d-check-valve
store_origin: MX
region: Mexico
---

# 7.25 PSI max pressure rating 3/8" quick connect fitting NSF certified BPA-free POM plastic 3/8" tube O.D. check valve

**Brand:** eshiong
**Price:** $701
**Availability:** ❌ Out of Stock

## Summary

> 💧 Keep your water pure, your install simple, and your system protected—because clean water waits for no one!

## Quick Answers

- **What is this?** 3/8" tube O.D. check valve by eshiong
- **How much does it cost?** $701 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/511717144-3-8-tube-o-d-check-valve)

## Best For

- eshiong enthusiasts

## Why This Product

- Trusted eshiong brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Precision Flow Control:** One-way valve prevents backflow, protecting your RO system from contamination.
- • **Value Pack Convenience:** Two-pack ensures you’re stocked for multiple installations or replacements—never run dry.
- • **Universal Compatibility:** Standard 3/8" OD tube fitting fits most reverse osmosis and water filtration systems seamlessly.
- • **Certified Safety & Purity:** NSF, TUV, and SGS certified food-grade POM plastic keeps your water toxin-free and fresh.
- • **Effortless DIY Installation:** Push-to-connect design with non-locking clip means zero tools, zero hassle.

## Overview

This 3/8" Push to Connect One Way Check Valve by ESHIONG is a BPA-free, NSF-certified quick-connect fitting designed for reverse osmosis water filters. Made from durable food-grade POM plastic, it supports up to 7.25 PSI and prevents backflow to safeguard your water system. The tool-free, non-locking clip design enables fast, leak-free installation on standard 3/8" OD tubing. Sold in a convenient 2-pack, it’s ideal for maintaining purity in household and commercial RO setups.

## Description

desertcart.com: ESHIONG 3/8" Push to Connect One Way Check Valve for Reverse Osmosis Water Filter,NSF Certified Plastic Quick Connect RO Fittings (2 pcs) : Industrial & Scientific

Review: Great addition to RO drain lines - Perfect for air gaps on reverse osmosis systems. If you don't know already, your drain lines for the dishwasher and reverse osmosis systems need an air gap or high loop to prevent sewage from entering those systems. These check valves fit the reverse osmosis drain lines perfectly and are a good second line of defense against sewage contamination. Just be sure to use them in conjunction with a high loop. One of the valves was a little noisy at first but quieted down after a little use. Overall, these are a good value, fit well, easy to install, and serve their purpose well.
Review: These seem to be working fine to me - I tried hooking one of these up backwards and my flow stopped. Hooking it in the correct way the water seems to flow the same as before. I call this a success. If it lasts over a year then great! If not then well that's what I get for buying cheap. I may re-review if I notice they stop working at some point. Side note: Not sure why people think they can supply enough pressure with wee little human lungs. Obviously the psi in a water hose is going to be higher than a set of lungs can push. If someone tries to say they cant blow through it and gives a bad review, ignore it and keep scrolling. If you're not supplying measurable data and saying its crap then do us all a favor and stay out of the reviews. Thanks.

## Features

- Material:POM(Polyoxymethylene) . Food-grade material, BPA free，NSF、TUV、SGS certificated etc.
- Specification:Straight 3/8" inch To 3/8" inch OD Tube quick connect One-way Valve.Standard fitting for about 9.5mm water filter systems tube.
- Installation:Non-Locking Clip design offers an easy DIY installation without any tools .Push fit fittings ,100% leak free.
- Package Quantity:2 pack
- Application:Commonly used on outlet hose for reverse osmosis (RO) systems of laundry,gardening,beverage dispensing,refrigerator,ice maker,coffee machine,etc.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09VYZS5F8 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #15,179 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #266 in Pipe Fittings |
| Brand | ESHIONG |
| Certification | NSF |
| Color | White&Blue |
| Connector Type | Quick-connect |
| Customer Reviews | 4.4 4.4 out of 5 stars (303) |
| Date First Available | March 19, 2022 |
| Exterior Finish | Plastic |
| Item Weight | 0.635 ounces |
| Item dimensions L x W x H | 0.7 x 3.4 x 2.9 inches |
| Item model number | 2a17c7a7-630b-4ac6-a708-0ce7d4427d8d |
| Manufacturer | ESHIONG |
| Material | Plastic |
| Maximum Pressure | 7.25 Pound per Square Inch |
| Measurement System | inch, metric |
| Number of Pieces | 2 |
| Product Dimensions | 0.7 x 3.4 x 2.9 inches |
| Size | 3/8'' Inch |
| Style | 3/8'' Inch，2pcs |
| Thread Size | 0.375 inch |
| Thread Type | UNC |

## Product Details

- **Brand:** ESHIONG
- **Color:** White&Blue
- **Connector Type:** Quick-connect
- **Exterior Finish:** Plastic
- **Item Weight:** 18 Grams
- **Item dimensions L x W x H:** 0.7 x 3.4 x 2.9 inches
- **Material:** Plastic
- **Size:** 3/8'' Inch
- **Thread Size:** 0.375 inch
- **Thread Type:** UNC

## Images

![3/8" tube O.D. check valve - Image 1](https://m.media-amazon.com/images/I/41jzBLZIF7L.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great addition to RO drain lines
*by L***C on January 27, 2026*

Perfect for air gaps on reverse osmosis systems. If you don't know already, your drain lines for the dishwasher and reverse osmosis systems need an air gap or high loop to prevent sewage from entering those systems. These check valves fit the reverse osmosis drain lines perfectly and are a good second line of defense against sewage contamination. Just be sure to use them in conjunction with a high loop. One of the valves was a little noisy at first but quieted down after a little use. Overall, these are a good value, fit well, easy to install, and serve their purpose well.

### ⭐⭐⭐⭐⭐ These seem to be working fine to me
*by J***N on August 28, 2024*

I tried hooking one of these up backwards and my flow stopped. Hooking it in the correct way the water seems to flow the same as before. I call this a success. If it lasts over a year then great! If not then well that's what I get for buying cheap. I may re-review if I notice they stop working at some point. Side note: Not sure why people think they can supply enough pressure with wee little human lungs. Obviously the psi in a water hose is going to be higher than a set of lungs can push. If someone tries to say they cant blow through it and gives a bad review, ignore it and keep scrolling. If you're not supplying measurable data and saying its crap then do us all a favor and stay out of the reviews. Thanks.

### ⭐⭐⭐⭐⭐ 7.25 cracking pressure good for supply side
*by S***N on February 5, 2026*

Beware that the cracking pressure is 7.25 psi, so this is meant for supply side pressure. It won't work as a check valve on the drain side. And of course trying to breathe through it won't be enough pressure to push through.

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---

*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-03-14*