CheeMuii Brass DOT Air Line Fittings Kit 35PC — Push-to-Connect 1/4" 3/8" 1/2" with Tube Cutter, DOT/SAE Rated

CheeMuii 35PCS Brass DOT Air Line Fittings Kit delivers a complete set of DOT push-to-connect brass fittings and a tube cutter for fast, durable air-line repairs and installations.

This 35-piece assortment is built from CA360 brass and designed to meet DOT and SAE performance expectations for air brake and pneumatic lines. The kit groups common straight and tee union sizes—1/4", 3/8", and 1/2"—so you have the right fitting on hand when servicing trucks, RVs, trailers, or pneumatic equipment. Components are engineered for simple push-in connections, corrosion resistance, and reliable service across a wide temperature and pressure range.

How does this kit simplify air-line repair and installation?

Push-to-connect design removes the need for clamps or complex tools: insert tubing into the fitting and the internal collet seals and grips the tube. The included tube cutter lets you create square, burr-free tubing ends for better seals. Having multiple sizes available means fewer service interruptions and faster field repairs.

• Push-fit installation—no soldering or crimping required
• Tube cutter included for clean pipe preparation
• Common sizes (1/4", 3/8", 1/2") to match standard tubing
• Reusable fittings for quick disassembly and reconfiguration

Are these fittings compatible with DOT air brake systems?

Yes — the fittings are manufactured from CA360 brass and comply with DOT FMVSS 571.106 expectations and SAE J1131 requirements for air brake components. That makes them suitable for many brake-line and pneumatic applications when used with compatible tubing and following vehicle or equipment guidelines.

• Meets DOT and SAE reference standards for air systems
• Suitable for copper and approved pneumatic tubing
• Corrosion-resistant brass for long-term service in vehicles

What operating conditions do these brass fittings support?

The CheeMuii fittings tolerate vacuum up to 300 psi working pressure and temperatures from -40°F to +200°F (-40°C to +93°C). This range covers typical automotive, RV, and light industrial pneumatic needs, though you should always confirm with your tubing maker for exact pressure and temperature limits.

• Working pressure: vacuum to 300 psi
• Temperature range: -40°F to +200°F (-40°C to +93°C)
• Designed for durability and low permeability under normal use

Which vehicles and projects is this kit best suited for?

The assortment is intended for air suspension and brake service on trucks, trailers, and RVs, plus general pneumatic maintenance in workshops or hobby use. It’s also handy for garden machinery, tow rigs, and any situation that uses 1/4", 3/8", or 1/2" tubing for air. Keep in mind correct material matching and installation practice for safety.

• Truck, trailer, and RV air brake and suspension repairs
• Workshop pneumatic systems and compressed-air lines
• Garden equipment, lawn mowers, and towing mechanical links

Who is this for? Mechanics, fleet operators, RV owners, and DIYers who need a reliable, ready-to-use set of DOT-style push-lock air fittings will benefit most from this CheeMuii kit. It’s designed for people who want fast field repairs, a compact parts selection for common tubing sizes, and durable brass components that stand up to everyday automotive and pneumatic conditions. If you require fittings outside the listed sizes or for specialized high-pressure systems, consult manufacturer specifications before use.