---
product_id: 7916056
title: "Milton S-684-4 1/4\" MNPT Male Tank Valve, includes Protective Caps (Pack of 2)"
brand: "milton"
price: "R394"
currency: ZAR
in_stock: true
category: "Milton"
url: https://www.desertcart.co.za/products/7916056-milton-s-684-4-1-4-mnpt-male-tank-valve
store_origin: ZA
region: South Africa
---

# Prevents air leakage up to 200 PSI 1/4" MNPT male thread for secure fit Includes protective caps for durability Milton S-684-4 1/4" MNPT Male Tank Valve, includes Protective Caps (Pack of 2)

**Brand:** milton
**Price:** R394
**Availability:** ✅ In Stock

## Summary

> 🔩 Lock in your air, unlock your productivity!

## Quick Answers

- **What is this?** Milton S-684-4 1/4" MNPT Male Tank Valve, includes Protective Caps (Pack of 2) by milton
- **How much does it cost?** R394 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/7916056-milton-s-684-4-1-4-mnpt-male-tank-valve)

## Best For

- milton enthusiasts

## Why This Product

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

## Key Features

- • **Leak-Proof Precision:** Engineered to lock in air pressure and eliminate costly leaks during vessel filling.
- • **Trusted Legacy Brand:** Milton’s quality air accessories have powered professionals since 1943—join the elite users.
- • **Dual-Pack Convenience:** Two valves included with protective caps, so you’re always ready for your next project or emergency.
- • **Compact & Durable Design:** At just 1.5" length with brass construction, it fits seamlessly while standing up to heavy use.
- • **Pressure-Ready Performance:** Rated for a maximum of 200 PSI, ensuring safe and reliable operation under demanding conditions.

## Overview

The Milton S-684-4 1/4" MNPT Male Tank Valve pack of 2 offers a reliable, brass-built solution to prevent air leakage during compressor vessel filling. Designed for up to 200 PSI and featuring protective caps, these compact valves ensure durability and precision. Trusted since 1943, Milton delivers professional-grade air accessories favored across automotive, industrial, and heavy-duty markets.

## Description

Our Milton 1/4" MNPT tank valves are made to be used with an air compressor to prevent air from leaking out when filling vessels. A standard core valve and plastic cap are included giving the product an overall length of 1.5”. Do not exceed 200 PSI when using this tank valve.

## Features

- Prevents Air from Leaking: This handy tank valve helps prevent the loss of air when filling vessels with an air compressor
- Dimensions: Overall length including the plastic cap is 1.5”. The cap thread size is .305-32
- Maximum Air Pressure of 200 PSI: To ensure safe use of this tank valve, it is recommended that the air pressure be kept at a maximum of 200 PSI
- NPT: This tank valve has a 1/4" male national pipe thread
- #1 Source for Quality Air Accessories: Since 1943, Milton has been providing quality accessories to the Automotive, Industrial, Hardware, Agriculture, Heavy-Duty Fleet and MRO markets
- Milton is your number 1 source for Quality Air Accessories
- Since 1943 Milton has been producing Quality Air Accessories
- Milton covers automotive, industrial, hardware, agriculture, heavy-duty fleet and MRO markets

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001PLI4BA |
| Best Sellers Rank | #83,219 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #221 in Air-Compressor Accessories |
| Brand | Milton |
| Brand Name | Milton |
| Connector Type | Cap |
| Customer Reviews | 4.7 out of 5 stars 2,089 Reviews |
| Exterior Finish | Plastic |
| Global Trade Identification Number | 00030937400383 |
| Included Components | 1/4" MNPT Male Tank Valve |
| Inlet Connection Size | 0.25 inches |
| Inlet Connection Type | National Pipe Tapered |
| Item Dimensions | 2 x 1 x 1 inches |
| Item Type Name | 1/4" MNPT Male Tank Valve |
| Item Weight | 22.68 g |
| Item dimensions L x W x H | 2 x 1 x 1 inches |
| Manufacturer | Milton |
| Manufacturer Part Number | S-684-4 |
| Material | Brass |
| Material Type | Brass |
| Maximum Pressure | 200 psi |
| Model Number | S-684-4 |
| Number of Items | 1 |
| Number of Packs | 2 |
| Number of Pieces | 1 |
| Number of Ports | 2 |
| Outlet Connection Size | 0.25 inches |
| Outlet Connection Type | MNPT |
| Set Name | 1/4" MNPT Male Tank Valve Set (2 Piece) |
| Size | Pack of 2 |
| Specification Met | Meets general industry standards for air compressor tank valves |
| Thread Size | 1/4" |
| Thread Type | NPT |
| UPC | 031113196373 735090074302 069060287356 030937400383 |
| Unit Count | 2 Count |
| Valve Type | Male Tank Valve |

## Product Details

- **Brand:** Milton
- **Exterior Finish:** Plastic
- **Inlet Connection Size:** 0.25 Inches
- **Inlet Connection Type:** National Pipe Tapered
- **Item dimensions L x W x H:** 2 x 1 x 1 inches
- **Material:** Brass
- **Maximum Operating Pressure:** 200 Pound per Square Inch
- **Number of Ports:** 2
- **Outlet Connection Size:** 0.25 Inches
- **Outlet Connection Type:** MNPT

## Images

![Milton S-684-4 1/4" MNPT Male Tank Valve, includes Protective Caps (Pack of 2) - Image 1](https://m.media-amazon.com/images/I/6136lcD4a-L.jpg)
![Milton S-684-4 1/4" MNPT Male Tank Valve, includes Protective Caps (Pack of 2) - Image 2](https://m.media-amazon.com/images/I/61KF15EFvKL.jpg)
![Milton S-684-4 1/4" MNPT Male Tank Valve, includes Protective Caps (Pack of 2) - Image 3](https://m.media-amazon.com/images/I/51GaYKKyIEL.jpg)
![Milton S-684-4 1/4" MNPT Male Tank Valve, includes Protective Caps (Pack of 2) - Image 4](https://m.media-amazon.com/images/I/61qR57kTUUL.jpg)
![Milton S-684-4 1/4" MNPT Male Tank Valve, includes Protective Caps (Pack of 2) - Image 5](https://m.media-amazon.com/images/I/71UWzrJbEFL.jpg)

## Available Options

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

## Questions & Answers

**Q: How big is the other side diameter?**
A: Shrader valve (same as bicycle and automotive tires)

**Q: 1/4" male on one end and shrader male on the the other end? Remove the core to make it a stright pass though for another 1/4 fitting? Works?**
A: If you mean to use it as a ¼" nipple, why would you?  Besides, the schrader end isn't ¼" NPT.

**Q: Why are these fittings made out of brass? Is pipe dope or teflon tape necessary on the threads?**
A: The rigidity of steel might allow it leak - brass is good - Teflon tape is small insurance- do it and move on !

**Q: Can i mount this on both ends of a venturi tube in my home irrigation system (sch40 pvc) to measure the water pressure drop?**
A: I suppose it would work. I guess u will tap the tube so u will get a tight connection.

## Frequently Bought Together

- Milton S-684-4 1/4" MNPT Male Tank Valve, includes Protective Caps (Pack of 2)
- Tire Deflator Kit Universal Adjustable Pack of 4 Automatic for Cars, Trucks

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-09-30*