CheeMuii 35‑Piece Brass DOT Push‑Lock Air Line Fittings Kit — 1/4" 3/8" 1/2" with Tube Cutter, CA360 DOT‑Rated

CheeMuii 35PCS Brass DOT Air Line Fittings Kit is a complete push-to-connect DOT-approved brass fitting assortment with unions, tees and a tube cutter for 1/4", 3/8" and 1/2" air lines.

This kit gathers the most common DOT-style push-lock unions and tee fittings in one compact package so you can repair, extend, or reconfigure air brake and pneumatic lines quickly. All fittings are manufactured from CA360 brass to meet DOT FMVSS 571.106 and SAE J1131 considerations for air brake systems. The set includes 35 pieces and a tube cutter so you have sizes and tools on hand for trucks, trailers, RVs, lawn equipment and general shop plumbing tasks.

What parts are included and which tube sizes do they fit?

The set contains a balanced mix of straight unions and tee unions in three common DOT sizes plus a dedicated cutter. That variety covers typical on-vehicle repairs and shop projects without buying individual fittings.

• 8 × 1/4" straight union DOT fittings
• 8 × 3/8" straight union DOT fittings
• 6 × 1/2" straight union DOT fittings
• 4 × 1/4" tee union DOT fittings
• 4 × 3/8" tee union DOT fittings
• 4 × 1/2" tee union DOT fittings
• 1 × tube cutter sized for the included tubing diameters

How durable and safe are these brass DOT fittings?

CheeMuii brass fittings are made from CA360 brass, offering corrosion resistance and consistent mechanical properties over a wide temperature range. They are produced to align with DOT and SAE guidelines relevant to air brake systems for dependable performance in vehicle and workshop environments.

• Material: CA360 brass for corrosion resistance
• Standards: Compatible with DOT FMVSS 571.106 and SAE J1131 contexts
• Temperature range: −40°F to +200°F (−40°C to +93°C)
• Pressure handling: vacuum to 300 psi (follow tubing maker limits)

How easy is installation and removal of these push-to-connect fittings?

These DOT-style push lock fittings use a simple push-in sealing method—insert the tubing until it seats and the internal grab ring holds the tube. Removal is also straightforward with common push-release or pull-back techniques, making field repairs fast without soldering or thread sealants.

• Installation: push tube firmly into fitting until it seats
• Removal: depress release ring or pull back to extract tubing
• No special tools required beyond the included tube cutter
• Reusable: fittings can be disassembled and re-used in many cases

Where can I use these fittings and what tubing types work best?

The kit is intended for air brake lines, air suspension plumbing, general pneumatic connections and maintenance tasks on trucks, trailers, RVs and shop equipment. They pair well with copper and compatible plastic DOT-rated tubing; always follow the tubing manufacturer's pressure and temperature recommendations.

• Typical uses: truck/RV brake lines, air suspension, trailers
• Compatible tubing: copper and DOT-compatible plastics
• Ideal for: leak repairs, extensions, tee branches and retrofits
• Also useful in: industrial shops, towing gear, lawn/garden machinery

Who is this for? The CheeMuii 35PCS DOT Brass Air Line Fittings Kit is aimed at professional mechanics, fleet maintenance personnel, DIY vehicle owners and workshop technicians who need an on-hand assortment for frequent pneumatic repairs and installs. If you service trucks, trailers, RVs, or operate a shop that works with air brakes or suspension systems, this kit supplies common DOT brass fittings and a cutter to speed routine fixes and reduce downtime.