CheeMuii DOT air line fittings kit — 78‑Piece CA360 brass set, DOT‑rated push‑lock & NPT fittings

CheeMuii 78-piece DOT brass air line fittings kit supplies a complete assortment of CA360 brass push-lock and NPT air fittings plus Schrader inflation valves and tools for dependable air brake and suspension repairs.

This kit gathers the common DOT air line components technicians and vehicle owners reach for when repairing or routing air systems on trucks, trailers and RVs. All metal parts are manufactured from CA360 pure brass and are designed to meet D.O.T. FMVSS 571.106 and SAE J1131 requirements for air brake system compatibility. The set includes both push-to-connect and threaded NPT pieces, pre-applied thread sealant, and a couple of hand tools so you can diagnose and fix leaks quickly.

What pieces are included and how is the kit organized?

The CheeMuii kit contains 78 total components split across common fitting types and sizes for flexibility during repairs and custom routing. Counts and part styles are arranged to cover straight runs, tees and elbow connections plus inflation points and a couple of service tools.

• 18 brass tube tee fittings for 1/8"–1/2" applications
• 28 straight union connectors for inline joining
• 14 straight push-connect with NPT threads and 14 90° elbow NPT fittings
• 2 brass 1/4" Schrader inflation valves with protective caps
• 2 tube cutters and 2 rolls of Teflon sealing tape included

Are these fittings DOT-rated and what materials do they use?

Yes — CheeMuii DOT air fittings are made from CA360 pure brass and engineered to satisfy DOT and SAE guidelines relevant to air brake systems. That metallurgy offers corrosion resistance, reliable ductility at elevated temperatures, and low air permeability compared with lower-grade alloys.

• CA360 pure brass construction for long service life
• Manufactured to meet D.O.T. FMVSS 571.106 and SAE J1131 standards
• Resists corrosion and withstands repeated exposure to road conditions

What operating pressures and temperatures can these fittings handle?

The brass components are suitable for a wide range of operating conditions typically encountered in vehicle air systems, from vacuum up to high pressure. Always confirm limits with your tubing manufacturer, but this kit is built to tolerate demanding environments for trucks and heavy equipment.

• Working pressure from vacuum up to 800 PSI
• Temperature range −40°F to +248°F (−40°C to +120°C)
• Pre-applied thread sealant on NPT male connectors for improved sealing

How easy is installation and where will I use these fittings?

Installation is straightforward: push-lock connections seat quickly and the NPT pieces thread in with pre-applied sealant to minimize leaks. The included tube cutters and Teflon tape make on-vehicle repairs and shop installs faster and cleaner.

• Push-to-connect design for tool-free seating on compatible tubing
• NPT threads with factory-applied sealant reduce leak troubleshooting
• Commonly used on semi trucks, trailers, RV air suspension and air brake lines

Who is this for: The CheeMuii 78-piece DOT air line fittings kit is aimed at professional mechanics, fleet maintenance crews and do-it-yourself vehicle owners who service semi trucks, trailers and RVs. If you need a comprehensive set of durable brass push-lock and threaded fittings, plus inflation valves and basic tools to keep air systems sealed and serviceable, this kit covers most everyday needs without sourcing parts individually.