100 ft 1/4ft + 50 ft 3/8ft DOT Air Line Kit - Complete 90 Pc Set

In this review the CheeMuii DOT air line kit is evaluated for technicians and DIYers who need a complete pneumatic plumbing solution. The bottom line: this kit's biggest selling point is the comprehensive combination of PA12 DOT tubing and CA360 brass fittings that meet DOT and SAE requirements, which makes it attractive for air suspension, truck, trailer and workshop repairs while offering long service life and high pressure tolerance.

Key Features

• Complete kit: Includes 100 ft of 1/4' tubing and 50 ft of 3/8' tubing plus 90 brass and accessory pieces so most repair jobs can be completed without extra purchases.
• DOT compliant fittings: CA360 brass fittings meet D.O.T. FMVSS 571.106 and SAE J1131 guidance, offering corrosion resistance and high-temperature ductility for longevity.
• High-strength tubing: PA12 nylon DOT air lines resist impact and wear, remain flexible for routing, and tolerate wide temperature ranges for reliable field performance.
• Pressure capability: 1/4' tubing rated to operate from vacuum to 500 PSI and 3/8' tubing to 800 PSI for demanding pneumatic systems while following manufacturer recommendations.
• Inflation valves included: Two brass 1/4' Schrader valves with protective caps provide a manual inflation point for air spring suspension bags.
• Handy accessories: Cutter, Teflon tape, ferrules, bushings and couplers are included so users can assemble and seal lines on first use.

Who It's For

The kit is best for professional mechanics, fleet technicians, and experienced DIYers who work on air suspension, semi truck or trailer air systems and need DOT-compliant tubing and durable brass fittings. The full complement of fittings and long lengths of both 1/4' and 3/8' DOT hose mean it covers most common routing and repair scenarios without multiple purchases.

Less suitable for hobbyists who only need a single coupling or short lengths of hose, or for applications that demand specialized non-DOT materials. Also, those who require completely welded or permanent metal lines rather than push-lock or NPT threaded fittings should consider alternative products.

Pros & Cons

Pros

• Comprehensive 90-piece assortment lets users complete complex runs and repairs from one kit.
• CA360 brass fittings and PA12 tubing meet DOT and SAE standards for reliability and corrosion resistance.
• The tubing tolerates wide temperature ranges and high working pressures for demanding environments.
• Includes practical tools and accessories such as a cutter and Teflon tape for immediate use.

Cons

• Some users report mixed leak resistance, so careful sealing and correct assembly are important to avoid sifts.
• Push-lock and NPT fittings may require occasional retightening in vibration-heavy installations.

Specifications

Our Verdict

The CheeMuii 90-piece DOT air line kit is a strong value for professionals and experienced DIYers who need DOT-approved tubing and a broad selection of brass fittings for air suspension, truck and trailer repairs. It combines high-strength PA12 hose and CA360 brass fittings in a ready-to-use package, though installers should watch assembly technique to minimize occasional leak reports.

Frequently Asked Questions

Are the fittings DOT approved?
Yes, the CA360 brass fittings meet D.O.T. FMVSS 571.106 and SAE J1131 requirements.

What pressures can the tubing handle?
The 1/4' tubing is rated to 500 PSI and the 3/8' tubing to 800 PSI; follow manufacturer guidance for pressure and temperature variations.

Does the kit include tools to cut and seal hose?
Yes, the kit includes a cutter and Teflon tape along with ferrules and bushings for assembly.