Brass Hex Coupler – Female NPT Fitting (1/4" & 1/2")
Brass Hex Coupler – Female NPT Fitting (1/4" & 1/2")
Available in stock (17)
Couldn't load pickup availability
Get $20 off when you spend $1,000 or more! Learn more
Secure Female NPT Coupler for Gas and Fluid Applications
Brass Hex Coupler – Female NPT offers a cost-effective, clean solution for connecting male-threaded NPT parts in gas or fluid systems. Precision-machined and burr-free, this coupler ensures tight, secure connections when used with proper thread sealant. Available in 1/4" and 1/2" FNPT sizes.
🔧 Features
- — Female NPT threads (1/4"-18 or 1/2"-14)
- — Hex design allows easy installation with standard tools
- — Made from durable, corrosion-resistant brass
- — Debris-free machining for clean, ready-to-use threads
✅ Advantages
- — Ensures tight compression between NPT-threaded parts
- — Supports high-integrity seals in low- and medium-pressure systems
- — Reduces leak risk when used with yellow gas-rated PTFE tape
- — Improves assembly speed with tool-friendly hex profile
🎯 Benefits
- — Reliable connector for gas, air, and fluid systems
- — Economical solution for non-potable line connections
- — Efficient part replacement or build-out for custom assemblies
- — Not rated for food or drink contact applications
🛠 How to Use
Apply yellow gas-rated PTFE tape or appropriate thread sealant to male threads. Thread the brass coupler onto the fitting and tighten securely using a wrench on the hex body.
📅 When to Use
Use to connect two male-threaded components in gas lines, vacuum systems, or fluid circulation setups—especially where brass is a preferred cost-saving material.
Available in 1/4" and 1/2" FNPT — clean, durable, and ready to install.
📋 Technical Specs
- — Material: Brass
- — Connection Type: Female NPT
- — Thread Sizes: 1/4"-18 FNPT, 1/2"-14 FNPT
- — Design: Hex Coupler
- — Sealant Required: Yes – PTFE tape (yellow gas-rated recommended)
- — Application: Air, gas, oil, and fluid systems (non-food)
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Discover more in our FAQs
How do I cancel or edit an order?
How do I cancel or edit an order?
Unfortunately, we cannot cancel orders due to a change of mind. However, we understand that mistakes happen. If you need to edit your order information, such as the delivery address or contact number, please contact our customer service as soon as possible.
Here’s what you can do:
- Contact our customer service via email address, or Live Chat.
- Have your order number ready when contacting customer service.
- We cannot guarantee changes to orders after 24 hours of placement. This is because orders may be processed once received
How can I track my order?
How can I track my order?
You can track your order by checking the shipping confirmation email, which contains a tracking number and a link to the courier's website. Alternatively, log in to your account on our website, navigate to "My Orders," and click on the tracking link provided for your order.
What if there is a problem with my order?
What if there is a problem with my order?
If there is an issue with your order, please contact our customer service team as soon as possible. You can reach us via email, phone, or through the contact form on our website. Provide your order number and a brief description of the problem so we can assist you quickly.
I didn't receive all of my order?
I didn't receive all of my order?
If part of your order is missing, please check the shipping confirmation email to see if the items were sent separately. If all items should have arrived together or if you have concerns, contact our customer service team with your order number. We’ll investigate and resolve the issue promptly.