6 Best Pneumatic Tubing Kits For Custom Van Builds

Van life relies on pneumatic systems for everything from tire inflation and air horns to secondary air suspension and pneumatic door locks. Selecting the right tubing and fittings determines whether a build stays operational on a bumpy forest road or springs a persistent leak miles from civilization. Relying on inferior components is the fastest way to turn a convenient convenience into a recurring maintenance headache.

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SMC Polyurethane Kit: Best for Reliability

SMC is the gold standard for industrial pneumatic components, and their polyurethane tubing is engineered for long-term consistency. If a van build requires a system that simply works without constant monitoring, this is the default choice. The flexibility of this tubing allows for tight-radius routing behind cabinetry and through cramped chassis gaps without the risk of kinking.

This product is ideal for van builders who prioritize longevity over initial cost savings. While the price point is higher than generic alternatives, the peace of mind offered by consistent wall thickness and airtight seals is worth the investment for critical infrastructure. Avoid these if the budget is strictly tight, but choose them if a system overhaul is the last thing wanted years down the road.

Viair Braided Hoses: For High-Pressure Use

High-pressure applications, such as heavy-duty onboard air compressors for tires or air lockers, demand more than standard plastic lines. Viair’s braided stainless steel hoses provide a critical layer of heat and abrasion resistance that plastic tubing cannot match. These are essential for segments of the build located near the engine bay or near exhaust heat.

The durability of these hoses makes them excellent for vibration-heavy sections of the vehicle. By using braided lines at the compressor output and transitioning to static lines further along the chassis, the system gains a necessary “buffer” zone. If the build involves aggressive off-road travel, integrating these hoses into the high-pressure loop is a non-negotiable safety step.

ATP Surethane Tubing: Best All-Around Value

ATP Surethane is widely regarded as the sweet spot for those balancing performance with a sensible budget. This ether-based polyurethane tubing resists hydrolysis, meaning it won’t break down when exposed to the moisture common in vehicle undercarriages. It maintains a supple, workable feel even in colder climates where cheaper plastics turn brittle.

This tubing is the perfect recommendation for most DIY van projects. It is robust enough for suspension or pneumatic storage systems while remaining easy to source and install. If a balance between professional-grade durability and reasonable costs is the goal, skip the specialty industrial brands and opt for this reliable workhorse.

Airtac Assortment Kit: For Complex Systems

Complex air systems often require a variety of port sizes, elbows, and Y-splitters that are difficult to track down individually. The Airtac assortment kits provide a comprehensive inventory of push-to-connect fittings that simplify the design process. Having these modular components on hand allows for real-time adjustments as the build evolves.

These kits are a boon for the builder who is still figuring out their layout during the construction phase. However, keep in mind that the quality of bulk-assortment fittings can sometimes vary, so always perform a soapy-water leak test on every connection. These kits are excellent for prototyping and secondary systems, but use high-end brass or brand-name fittings for primary lines under high pressure.

Coilhose Nylon Tubing: For High-Temp Areas

Nylon tubing is inherently stiffer and possesses a higher melting point than standard polyurethane, making it the preferred choice for engine-adjacent routing. In a van, the area around the engine and radiator can reach extreme temperatures that quickly deform soft plastic lines. Nylon retains its shape under high heat, ensuring constant flow rates.

Choose this material only for static runs where the line does not need to move or flex frequently. Because it is rigid, it is less forgiving during installation and requires precise measurements. If the goal is a robust setup that runs near high-heat sources, nylon is the safest path, provided it is secured properly to prevent vibration wear.

DIYSELF PU Kit: Best Budget Starter Option

The DIYSELF polyurethane kits are designed for builders who need a complete, user-friendly starter set without the research overhead of buying components individually. These kits typically include the most common tubing diameters and standard push-to-connect fittings needed for basic pneumatic tasks. They represent the most accessible entry point into onboard air systems.

This option is perfect for straightforward installations, such as simple air horn setups or basic auxiliary air supplies. While not recommended for heavy-duty, mission-critical systems, they are more than adequate for light-duty functions. If the project is modest and the goal is to get a system functional quickly, this is the most practical starting point.

Choosing Your Tubing: Polyurethane vs. Nylon

The choice between polyurethane (PU) and nylon depends entirely on the operating environment. PU is flexible, resilient, and highly resistant to impact, making it ideal for the majority of interior and chassis runs where the lines might rub or shift. It is the primary choice for any application requiring vibration dampening.

Nylon, conversely, offers superior temperature and chemical resistance but lacks the flexibility of PU. It is less likely to collapse under high vacuum and remains stable in extreme heat. Use polyurethane for the bulk of the interior and suspension work, reserving nylon for the short, hot stretches near the engine or heating exhaust.

Sizing and Pressure Rating Essentials

Standard van pneumatic systems generally operate between 90 and 150 PSI. The tubing must be rated for at least the maximum output of the compressor, plus a safety margin to account for pressure spikes. Selecting tubing that is undersized will restrict airflow, causing the compressor to work harder and run hotter than necessary.

Always check the inner diameter (ID) and outer diameter (OD) requirements of the specific push-to-connect fittings being used. Even a minor discrepancy in tubing thickness can lead to slow, persistent leaks that drain the system overnight. When in doubt, size up the wall thickness to ensure the connection has sufficient material to grip.

Routing and Securing Your Air Lines Safely

Vibrations are the silent enemy of pneumatic systems. Every foot of tubing must be secured with P-clamps or zip ties to prevent it from rubbing against sharp metal edges or hot engine components. A line left to chafe against the chassis will inevitably fail, usually at the most inconvenient moment possible.

When routing, ensure there is a gentle “service loop”—a small amount of slack—at every connection point. This allows the tubing to move with the vehicle frame without putting stress on the fitting seals. Proper management of these lines significantly extends the service life of the entire pneumatic system.

Push-to-Connect vs. Compression Fittings

Push-to-connect fittings are the modern industry standard due to their ease of installation and ability to be reused. They work by using internal teeth to grip the tubing while an O-ring creates the seal. They are ideal for quick builds, though they do require the tubing to be cut with a perfectly square edge to seat correctly.

Compression fittings use a brass ferrule to crush onto the tubing, creating a more permanent, high-vibration-resistant connection. These are generally overkill for light pneumatic systems but are highly recommended for the high-pressure side of a compressor. Use push-to-connect for the majority of the build to save time, but default to compression fittings at the compressor head where heat and vibration are highest.

Carefully planning the pneumatic layout of a van conversion is as important as the electrical design. By understanding the specific material properties of the tubing and ensuring every connection is secured against the realities of the road, the builder can create a reliable system that withstands years of use. Choose the right materials today to avoid the frustration of troubleshooting air leaks on the side of the highway tomorrow.