When it comes to modern plumbing, few materials have changed the game like PEX piping. It’s flexible, affordable, and easy to install compared to traditional copper or CPVC. But if you’ve started shopping, you’ve likely run into two common types: PEX-A and PEX-B.
So what’s the difference between PEX-A and PEX-B? Which one is better for your home or project? In this guide, we’ll break down the differences, compare durability, flexibility, cost, and installation methods, and recommend the best tools and kits for each option.
Quick Picks: Best PEX Kits & Tools
- Best Overall PEX-A Kit: Uponor Expansion PEX Starter Kit – Complete kit for PEX-A installations with expansion tool and fittings.
- Best Budget PEX-B Kit: SharkBite PEX-B Clamp Tool & Pipe Kit – Affordable and easy to use for DIY installations.
- Best Premium: Milwaukee ProPEX Expansion Tool Kit – Contractor-grade tool for PEX-A with fast, reliable connections.
PEX-A vs PEX-B: The Main Differences
PEX-A and PEX-B are both forms of cross-linked polyethylene, but they’re made with different processes and have distinct characteristics:
| Feature | PEX-A | PEX-B |
|---|---|---|
| Manufacturing Method | Engel Method (highest crosslinking) | Silane Method (slightly lower crosslinking) |
| Flexibility | Very flexible, great for tight bends | Stiffer, more resistant to kinking |
| Fittings | Uses expansion fittings | Uses crimp/clamp fittings |
| Kink Resistance | Kinks easily but can be fixed with heat | More resistant to kinks but permanent if bent |
| Chlorine Resistance | Lower | Higher, better for chlorinated water |
| Freeze Resistance | Better (more flexible) | Good, but slightly less flexible |
| Cost | Higher | Lower |
Advantages of PEX-A
- Superior flexibility: Can bend around corners without fittings.
- Expandable connections: Expansion fittings create strong, leak-free seals.
- Repairable kinks: Heat gun can restore shape if kinked.
- Best freeze resistance: Expands slightly when frozen, reducing burst risk.
Advantages of PEX-B
- More affordable: Lower material and fitting costs.
- High chlorine resistance: Better for municipal water with high chlorine.
- Durable fittings: Uses simple crimp or clamp rings that are inexpensive and widely available.
- Stiffer pipe: Holds shape better when installed along walls.
Buyer’s Guide: Choosing Between PEX-A and PEX-B
Which one should you choose? It depends on your project:
- PEX-A: Best for remodels, tight spaces, or cold climates where freeze resistance matters.
- PEX-B: Best for budget-conscious homeowners, straight runs, or municipal water systems with higher chlorine levels.
- PEX-A Tools: Requires an expansion tool (more expensive but easier for large projects).
- PEX-B Tools: Requires a crimp/clamp tool (cheaper, simpler for DIY installs).
Detailed Product Reviews
1. Uponor Expansion PEX-A Starter Kit
Who it’s for: Homeowners and pros installing PEX-A with expansion fittings.
- Key Benefits: Includes expansion tool, fittings, and PEX pipe.
- Pros: Complete kit, high-quality Uponor fittings, reliable connections.
- Cons: Higher upfront cost than clamp kits.
Final Verdict: The best starting kit for PEX-A installations. Check Price
2. SharkBite PEX-B Clamp Tool & Pipe Kit
Who it’s for: DIYers looking for a simple, affordable PEX-B solution.
- Key Benefits: Includes PEX-B tubing, clamps, fittings, and tool.
- Pros: Affordable, easy to use, reliable for homeowners.
- Cons: Less flexible than PEX-A.
Final Verdict: Best budget-friendly PEX kit. See Price
3. Milwaukee ProPEX Expansion Tool Kit
Who it’s for: Contractors and serious DIYers using PEX-A frequently.
- Key Benefits: Battery-powered expansion tool with multiple heads.
- Pros: Fast, professional results, works with Uponor fittings.
- Cons: More expensive than manual tools.
Final Verdict: Best pro-grade option for PEX-A installations. Check Price
4. Apollo PEX-B Crimp Tool Kit
Who it’s for: Budget-conscious buyers working with PEX-B.
- Key Benefits: Includes crimp tool, fittings, and calibration gauge.
- Pros: Affordable, easy to use, widely compatible.
- Cons: Less flexible system than PEX-A.
Final Verdict: A reliable and inexpensive kit for PEX-B installs. View Price
5. Uponor ProPEX Expansion Fittings
Who it’s for: Users committed to PEX-A installations.
- Key Benefits: Expansion sleeves and fittings designed for maximum durability.
- Pros: Leak-free, long-lasting, trusted brand.
- Cons: Only compatible with PEX-A.
Final Verdict: The gold standard fittings for PEX-A. See Price
6. SharkBite EvoPEX Push-to-Connect Fittings
Who it’s for: DIYers who want tool-free installation.
- Key Benefits: Push-to-connect system works with PEX-B.
- Pros: No tools needed, fast, reliable.
- Cons: More expensive than crimp rings.
Final Verdict: The easiest way to install PEX-B. Check Price
Frequently Asked Questions
Which is better: PEX-A or PEX-B?
PEX-A is more flexible and easier to work with in tight spaces. PEX-B is cheaper, stiffer, and more resistant to chlorine. Both are excellent depending on your needs.
Can PEX-A and PEX-B be used together?
Yes, but fittings are different. You’ll need the proper connectors to transition between the two.
Which lasts longer: PEX-A or PEX-B?
Both have a lifespan of 40–50 years when installed properly. PEX-B may hold up better in chlorinated water systems.
Is PEX-A worth the extra cost?
If you’re working in tight spaces, cold climates, or want the flexibility of expansion fittings, yes. For budget installs, PEX-B is usually sufficient.
Do I need special tools for PEX-A and PEX-B?
Yes. PEX-A requires an expansion tool, while PEX-B uses a crimp/clamp tool. They are not interchangeable.
Conclusion
When comparing PEX-A vs PEX-B, the choice comes down to flexibility, cost, and application. PEX-A is more flexible and freeze-resistant, while PEX-B is more affordable and chlorine-resistant.
If you’re a homeowner tackling a remodel, PEX-A with expansion fittings may be the better choice. If you’re looking for a cost-effective solution for a straightforward installation, PEX-B is hard to beat.
Check today’s best PEX-A and PEX-B kits, fittings, and tools here