HASAOMOI Brass DOT 3/8" Push-to-Connect Tee Union, 4PCS — CA360 Brass, Tool-Free Installation

HASAOMOI Brass DOT 3/8" push-to-connect tee unions are corrosion-resistant brass pneumatic fittings designed to join three 3/8" tubes quickly and reliably for air systems and brake lines.

These DOT-style brass compression tube fittings are made from CA360 brass for long-lasting service in pneumatic and automotive applications. They accept 3/8" outside-diameter tubing and use a push-to-connect interface for fast assembly without tools. Rated for vacuum up to 250 psi and a wide temperature range, they are sized for typical nylon, copper, and air-line tubing used in workshops, trailers, and vehicle air systems.

How do I install HASAOMOI 3/8" DOT tee unions?

Installation is straightforward: push tubing fully into the fitting until it seats, and the internal grab ring secures the tube. To remove, press the release collar and pull the tubing free. No soldering or threaded adapters are required, making field replacements and service faster.

• Push-to-connect insertion — simply push until it stops.
• Release by pressing the collar and pulling the tube out.
• No special tools needed for assembly or disassembly.
• Compatible with 3/8" OD nylon, copper, and standard air tubing.

What operating conditions are these fittings rated for?

HASAOMOI brass tee unions handle vacuum up to 250 psi and a broad temperature span from -40°F to +200°F (-40°C to +93°C). These ratings cover most pneumatic and vehicle accessory tasks; however, always check your tubing maker’s specs for compatibility at extremes of pressure or temperature.

• Working pressure: vacuum to 250 psi.
• Temperature range: -40°F to +200°F (-40°C to +93°C).
• Material: CA360 brass with good corrosion resistance.
• Suitable for routine automotive and workshop uses.

Which systems and tubes are appropriate for these DOT fittings?

These tee unions are intended for air systems, brake line repairs, trailer connections, and workshop pneumatic lines. They are compatible with standard 3/8" OD tubing such as nylon and copper; they work well for air horns, gauges, seat inflators, mower repairs and similar low-to-medium pressure applications.

• Automotive brake and air accessory lines (follow local regulations for critical brake systems).
• Trailer air connections and towing equipment.
• Shop pneumatic circuits, gauges, and air-operated accessories.
• Garden equipment and small engine air lines.

What comes in the package and why choose brass?

The pack contains four 3/8" tube OD tee union DOT air fittings, enough for several repairs or to keep spares on hand. Brass construction brings durability, resistance to corrosion, and reliable sealing with common tubing materials. The compression-style design resists leaks when tubing is fully inserted and properly maintained.

• Package includes 4 tee unions, ready for immediate use.
• CA360 brass for strength and corrosion resistance.
• Compression/grab ring design for secure tube retention.
• Compact, serviceable fittings suitable for replacement parts stock.

Who is this for: These HASAOMOI brass DOT 3/8" tee unions suit DIY mechanics, trailer and RV owners, small repair shops, and anyone maintaining pneumatic lines or adding air accessories. If you need durable, easy-to-install fittings for common 3/8" tubing and want a set of replacement tees to keep on hand, this 4-piece pack offers straightforward, serviceable components without requiring specialized tools.