Product categories
- AIR MACHINE ACCESSORIES, FITTINGS AND VAC REPLACEMENT PARTS
- HYDRAULIC HOSE FERRULES - FERRULES MANUFACTURER
- INDUSTRIAL AND AUTOMITIVE COUPLERS & CONNECTORS
- PNEUMATIC BLOW GUN KITS AND BLOW GUN PRODUCTS
- PNEUMATIC HOSES
- PNEUMATIC, AUTOMOTIVE HOSE CRIMPERS AND DIES
- TIRE INFLATOR CHUCKS AND AIR FITTINGS
- TIRE INFLATOR GAUGE PRODUCTS
- Uncategorized
- VALVES PARTS PRODUCTS
- WATER BIBBS AND UTILITY WATER NOZZLES
Top rated products

3/8 Automotive Air Fitting – Automotive Standard 3/8" Series
If you're a technician looking for quality 3/8" automotive air fittings, we’ve got you covered at Diamond-U. We offer a range of standard and unique automotive air fittings designed with a tight tolerance needed to keep your air hoses securely connected while in use at your workshop. Diamond-U air fittings are designed to restrict leaks in your air lines and maintain a closed & complete system.
Why Choose Diamond-U to be Your Company's 3/8" Automotive Air Fitting Manufacturer?
At Diamond-U, we have a proven track record of producing durable and quality Pneumatic and Automotive equipment. Furthermore, our 3/8 automotive air fitting products are created to meet the highest quality and safety standards. We are committed to excellence in all aspects of our business and ensure that every product we offer is coupled with unmatched customer service.
As a reputable manufacturer in this industry, we have what it takes to accommodate your unique product needs to ensure you receive the products and solutions needed to get the job done. We process all types of orders. Whether you want to purchase a single item or in bulk, we can effortlessly fulfill your order.
What are the Benefits of Diamond-U's Automotive Standard 3/8 Series?
The 3/8 automotive air fitting series include couplers, plugs, connects and barbs in btoh male pipe thread & female pipe thread configuration. These couplers and connectors are heat treated and hardened to reduce the wear effect on mating surfaces. Similarly, they are made of a plated steel material that can allow a maximum pressure of 300 PSI, a temperature limit of 250 degrees Fahrenheit, and a maximum air circulation of 40 standard cubic feet/per minute.
Types of Products from Automotive Standard 3/8" Series Diamond-U Offers
- 1/4" Coupler 3/8" Barb
- 1/4" Coupler 3/8" FPT
- 3/8" Connector 1/4" MPT
Shop with Diamond-U Products Now!
Ready to buy? Shop our broad selection of 3/8" automotive air fittings today! Whether you want a single piece, wholesale quote, or a custom product, we have your back at Diamond-U. Get in touch with us now to get solutions to all your automotive air fitting needs.