Ailbiuko Brass DOT Air Brake Compression Straight Union Kit, 53‑Piece — CA360 Brass & Teflon Tape

Ailbiuko's 53-piece brass DOT air brake straight union kit supplies complete compression unions, ferrules and Teflon tape for reliable air-line repairs and installations.

This comprehensive kit gathers common straight union sizes and installation accessories so you can join or repair DOT-spec air brake tubing quickly. Manufactured from CA360 brass to meet D.O.T FMVSS 571.106 guidelines, the fittings resist corrosion and tolerate wide temperature swings. The set is designed for vehicle air brake lines, air-operated accessories, and workshop pneumatic repairs where secure, leak-resistant joints are required.

What exactly is included in the 53-piece Ailbiuko kit?

The kit contains a selection of straight compression unions in multiple diameters, an assortment of ferrule sleeves, and a roll of Teflon tape for thread sealing. Sizes cover the most common DOT air line diameters so you can handle a variety of tubing tasks without hunting for parts.

• 4 × 1/8" × 1/8" straight unions
• 6 × 1/4" × 1/4" straight unions
• 6 × 3/8" × 3/8" straight unions
• 2 × 1/2" × 1/2" straight unions; 1 × 5/8" × 5/8" union
• 34 ferrule sleeves and 1 roll (4m) of Teflon tape

How durable and heat-resistant are these brass DOT fittings?

Made from CA360 brass, the unions meet DOT FMVSS 571.106 air brake system requirements and offer good corrosion resistance and ductility. They tolerate a wide operating temperature range and are suitable for many automotive and industrial environments.

• Material: CA360 brass, designed for longevity
• Operating temperature: approximately -65°F to +200°F
• Working pressure: vacuum up to about 300 PSI (follow tubing maker specs)

Are these fittings easy to install and seal for leak-free connections?

The compression union design lets you join tubing securely by tightening the nut onto the ferrule; the included Teflon tape helps seal threaded connections. For the most secure joints, insert tubing fully, hand-tighten, then finish with a suitable wrench—additional tightening in tight spaces may require pliers or a torque approach to prevent loosening.

• Push-in tubing, then tighten nut over ferrule
• Wrap threads with included Teflon tape for extra sealing
• Use appropriate tools to secure fittings in confined or high-vibration areas

What are the common uses for this straight union compression fitting set?

This assortment is built for DOT-style air brake work as well as other pneumatic and automotive applications. It’s intended for copper or compatible tubing in vehicles, trailers, industrial equipment, and shop repairs where reliable, code-compliant unions are needed.

• Air brake line repairs and extension on trucks and trailers
• Air-operated seats, horns, gauges, and accessory lines
• Workshop pneumatic systems, lawn mower and towing machine air connections

Who is this for: Technicians, DIY mechanics, fleet maintenance teams and garage professionals who need a practical, DOT-compliant collection of straight unions and ferrules to repair or build pneumatic lines. If you regularly work on air brake systems, trailers, or vehicle air accessories and value durable brass parts plus the convenience of a ready assortment, this Ailbiuko 53-piece kit gives the common sizes and sealing materials to finish jobs more efficiently.