PEX Expansion vs Crimp vs SharkBite for Vans
Choosing the Right PEX Plumbing Method for a Camper Van
One of the earliest plumbing decisions in a camper van build is how you will connect PEX lines. All three common methods work. The difference is cost, durability, serviceability, and how the system holds up to vibration and temperature swings over time.
This guide explains SharkBite, crimp, and expansion plumbing from a van builder perspective so you can choose the right approach without overthinking it.
Why Plumbing Choice Matters More in Vans Than Houses
Camper vans experience constant vibration, wide temperature swings, and movement that residential plumbing never sees. Because of this, plumbing methods that work fine in a house may not be ideal in a mobile environment.
The best van plumbing systems prioritize secure connections, flexibility, and ease of service.
SharkBite PEX Fittings
The Easiest Option to Install
SharkBite fittings are push to connect fittings that require no special tools. They are popular with DIY builders because installation is fast and mistakes are easy to fix. You simply cut the PEX square, push the fitting on, and you are done.
For early prototyping or temporary systems, SharkBite is hard to beat.
Downsides of SharkBite in Camper Vans
SharkBite fittings rely on internal O rings and teeth to hold pressure. In vans, long term vibration and temperature cycling can shorten their lifespan. They are also bulkier than crimp or expansion fittings, which can make tight cabinetry more difficult to work around.
Most premium builders avoid SharkBite for permanent installs, even though it is convenient.
Crimp PEX Plumbing
The Most Common Builder Choice
Crimp PEX uses a brass fitting and a metal crimp ring that is compressed around the pipe using an inexpensive crimp tool. This method creates a strong mechanical connection that handles vibration well and has been used in RVs and marine applications for decades.
Crimp tools are affordable and fittings are widely available.
Why Builders Prefer Crimp Over SharkBite
Crimp connections are smaller, more durable, and easier to secure cleanly inside cabinets. Once crimped correctly, fittings rarely fail. This is why many production van builders and professional upfitters use crimp PEX almost exclusively.
Crimp also allows tighter routing around tanks pumps and water heaters.
Expansion PEX Plumbing
Flexible and Freeze Tolerant
Expansion plumbing uses PEX A tubing that expands to accept a fitting and then contracts around it. This method allows the pipe to flex and expand slightly under freezing conditions, which can reduce damage if water remains in the lines.
Expansion systems are common in high end residential plumbing and some premium van builds.
Downsides of Expansion Plumbing in Vans
The main downside is tooling cost. Expansion tools often cost up to $500 dollars, which is hard to justify for a single van build. The process also requires more space around fittings during installation.
While effective, expansion plumbing is less common simply due to cost and complexity.
How Each Method Handles Vibration and Movement
Vibration is the biggest enemy of van plumbing.
- SharkBite relies on internal seals and can loosen over time, these are known to fail after 10 years or so of movement.
- Crimp creates a rigid mechanical lock that holds up well to movement.
- Expansion allows flexibility but still requires careful installation.
For long term reliability, crimp and expansion outperform SharkBite in mobile applications.
Cost Comparison for Van Builders
SharkBite fittings are the most expensive per connection. Crimp fittings are inexpensive and tools are affordable. Expansion fittings are moderately priced but tools are costly.
For most builders, crimp offers the best balance of cost and performance.
Compatibility With Water Tanks and Components
Most camper van water tanks use half inch NPT threaded ports that transition easily to PEX. Even for the larger 1.5” ports they can be walked down to 0.5” fittings as needed.
Crimp and expansion systems integrate cleanly with these setups using brass adapters. SharkBite can be used, but the bulk of the fitting often complicates routing near tank ports.
This is another reason builders lean toward crimp.
When SharkBite Actually Makes Sense
SharkBite fittings can make sense for:
- Temporary test setups
- Emergency repairs
- Quick modifications
They are useful to have on hand, even if they are not used everywhere.
Builder Recommended Plumbing Approach
Based on real world installs:
- DIY first builds often start with SharkBite.
- Most professional builders use crimp PEX.
- Expansion is used selectively in premium builds where budget allows.
There is no single correct answer, but there is a clear industry trend.
Final Thoughts on PEX Plumbing Methods
The best plumbing method is the one you can install correctly and service confidently. For most camper vans, crimp PEX offers the best mix of durability, affordability, and ease of use. SharkBite is convenient but better suited for temporary use. Expansion performs well but comes with higher cost.
Choosing the right method early prevents leaks, frustration, and rebuilds later.
