ProPress vs Push Fittings | Pressure Test

ProPress vs Push Fittings | Pressure Test has been one of the most frequently requested comparisons among plumbing professionals and DIY enthusiasts alike. In this blog post, we’ll walk through a head-to-head pressure test featuring ProPress fittings, SharkBite Max (a well-known push-to-connect brand), and Quick Fitting (another push-to-connect option). You’ll see how each type of fitting fared under extremely high pressure—far beyond what typical residential or commercial water lines ever experience.

This showdown offers a real-world look at which fittings can withstand the most intense psi levels and how they fail when pushed to the brink. While your home may never reach pressures above 100 psi, these tests reveal how reliable each product might be if put to the ultimate challenge. Read on to discover which connection took the top spot, and to glean practical tips for your own copper installations.

Why Compare ProPress and Push Fittings?

The plumbing world offers a range of methods for connecting copper pipe. Traditionally, soldering (or brazing) has been the gold standard for a dependable, leak-free joint. However, tool-free push fittings (like SharkBite) and press fittings (like ProPress) have gained popularity for their speed and ease of use. Each system has its own design:

• Push fittings (Push-to-Connect) use an internal O-ring and stainless steel “teeth” that grip the pipe, requiring only that you insert the pipe to a specified depth.
• ProPress fittings have a dedicated O-ring but require a press tool to mechanically crimp the fitting onto the copper.

Both methods avoid open flames, which is a major advantage over soldering in terms of safety and convenience. However, some plumbers question the long-term reliability of push fittings, while others love the labor savings. ProPress, on the other hand, is widely seen as a robust professional system—but does it outperform push fittings at extremely high pressures? The only way to know is to test them side by side.

Understanding the Basics of ProPress

ProPress fittings, such as Viega-brand connections, come with an integrated O-ring. Once you slide your cleaned, deburred copper pipe into the fitting, you use a specialized press tool (for example, a Rigid RP-115 or similar) to compress the metal fitting around the pipe. The force from the press tool flares the copper and seats the O-ring snugly in place, forming a tight seal.

Key Features of ProPress

• Requires a powered press tool with the correct jaw size.
• Creates a leak-proof bond in seconds without any flame or chemicals.
• Works on various metals: copper, stainless steel (with appropriate fittings), and even carbon steel for certain applications.
• Fittings can withstand typical residential or commercial water pressures with plenty of overhead.

Because ProPress involves both an O-ring and a rigid mechanical crimp, many see it as a sturdy option, suitable for a wide variety of jobs. The big question: just how high can the pressure go before it fails?

How Push Fittings Work

Push-to-connect fittings—represented here by SharkBite Max and Quick Fitting—rely on a combination of an internal O-ring and metallic “teeth” or “collets.” When you push the copper pipe in, you must reach a specific insertion depth so the O-ring seals properly and the teeth engage behind the pipe’s outer diameter. In principle, the concept is simple: no crimping or pressing tools, no torches, no wrenches—just push.

Common Missteps with Push Fittings

• Skipping Deburring: Burrs or rough edges on the pipe can damage the O-ring or hamper a secure seal.
• Failure to Mark Insertion Depth: If you don’t insert the pipe fully, you’ll have a partial engagement that can lead to leaks or blowouts.
• Dirt or Debris: Grit on the pipe’s surface can compromise the O-ring.

The push-fitting design is widely embraced for quick repairs or in tight spaces where using a press tool or torch might be cumbersome. Many professionals, however, remain skeptical about push fittings for permanent installs behind walls—worried that the teeth or O-ring might eventually degrade, or that user error could cause future failures. Testing them well above normal operating pressures can shed light on whether these concerns are justified.

The Role of the O-Ring

A critical component in both push fittings and ProPress fittings is the O-ring. Whether it’s Nitrile (NBR), EPDM, or another elastomer, the O-ring must maintain a watertight seal throughout normal temperature and pressure fluctuations. In extremely high-pressure scenarios, the O-ring is typically the first point of vulnerability. If internal pressure dislodges or deforms the O-ring or crushes the fitting, water (and sometimes the entire copper pipe) will force its way out.

The Testing Setup

To compare performance, three identical copper pipe assemblies were prepared. Each assembly had the same length of Type M (or L) copper. At one end, a male adapter was installed, and at the other end, a cap. The difference lay in the brand or type of fitting used:

1. Quick Fitting: A push-to-connect brand with a male adapter and a female adapter plus plug.
2. ProPress (Viega): A brand-new ProPress fitting (one male adapter and one cap).
3. SharkBite Max: A well-known push-fitting competitor, also with a male adapter and a cap.

Preparing the Copper Pipe

• Cleaning and Deburring: Each pipe was thoroughly deburred inside and out, ensuring a clean edge for the O-rings to seat.
• Marking Insertion Depth: Normally recommended for push fittings, though in the video, the step is demonstrated as a crucial tip.
• Avoiding Scratches: Any scratches or gouges on the sealing area could compromise the seal.

Pressure Test Chamber

A specialized pressure chamber (often called a “blast chamber”) was used to ensure safety. The assembly was connected to a water supply and an air compressor. Water was introduced first, then pressurized air was used to push the internal pressure way beyond normal household ranges. A gauge measured psi until the fitting or pipe assembly failed.

Quick Fitting Test

First up: Quick Fitting. The pipe assembly was inserted into the push fittings. With brand-new, factory-fresh products, everything seated well. During the test, the pressure soared above normal levels and quickly hit around 2000 psi or slightly more before the push fitting failed. The final blowout:

• The stainless steel collet or ring that grips the copper was forcibly dislodged.
• The O-ring remained in place, but the outward force overcame the fitting’s mechanical hold.

Under normal circumstances, no residential or commercial water system sees 2000 psi. This test was purely to find the ultimate failure point.

ProPress Test

Next up was the ProPress assembly. Using a Rigid-brand press tool, the fittings were crimped onto the copper. The test again ramped pressure far beyond typical usage. This time, the gauge read around 3000 psi (somewhere near 3500 psi) before the fitting popped off:

• The copper pipe end was effectively forced out of the fitting.
• The ProPress fitting, O-ring, and pressed material remained largely intact. The mechanism basically let go at the copper boundary.

Hitting over 3000 psi is a testament to how secure a properly pressed fitting can be. In previous tests (as referenced in the video), sometimes press fittings might fail around 1500 psi. Variations in pipe type, fitting condition, or pressing technique can influence results. Nonetheless, crossing the 3000-psi threshold is impressive.

SharkBite Max Test

Finally, SharkBite Max took the stage. This brand stands out in the push-fitting market for robust teeth and an improved design over the original SharkBite line. Much like Quick Fitting, the assembly was placed in the chamber and pressurized:

• The gauge climbed to around 3000 psi before a blowout.
• The difference here was that after the first blow, the tester attempted to reseat it and run the test again. On the second try, it blew out more quickly, indicating that partial damage had been done to the fitting on the first burst.

Interestingly, the push-fitting performance was in the same ballpark as the ProPress test, at least on the first attempt. That suggests that modern push fittings can hold extremely high pressure—well above the standard 50–100 psi in most systems.

Overall Observations

1. Press Fittings Reached the Highest Single Reading
   At around 3200–3500 psi, the ProPress assembly edged out the others.
2. Push Fittings Exceeded Expectations
   Both Quick Fitting and SharkBite Max handled up to 2000–3000 psi before failing. That’s 20 to 30 times higher than normal municipal pressure.
3. Failure Mode
   In all cases, the fitting or pipe eventually parted ways. For push fittings, the collet and O-ring lost grip, allowing the pipe to shoot out. For ProPress, the mechanical crimp stayed intact, but the pipe forced its way out from the fitting’s pressed boundary.
4. Repeat Use
   Once a push fitting has blown off at extremely high psi, attempting to reuse it can be sketchy, as you may have compromised the internal components. ProPress fittings are single-use by design—the pressing transforms the fitting’s metal permanently.
5. Realistic Residential Pressures
   Since normal operation rarely exceeds 80–100 psi, every tested method would be more than adequate in typical conditions.

Practical Takeaways

• Any of these fittings can withstand normal household pressures with ease. Even the “lower” failure threshold was above 2000 psi. You’ll never see that in daily usage.
• Prep is critical for push fittings. Burrs or debris can lead to early failure, so always ream and clean your copper pipe.
• ProPress offers a professional approach that can handle very high pressures. It requires specialized tools but can be extremely reliable.
• Push fittings (SharkBite Max, Quick Fitting) remain a favorite for quick fixes. They’re also the go-to for tight spaces or emergency situations when time is crucial.

Best Practices for Installing Push or Press Fittings

1. Clean the Pipe
   Even a small dent or burr can jeopardize the O-ring. Use a deburring tool or reamer. Wipe away any debris.
2. Mark Insertion Depth
   With push fittings, always mark how far the pipe needs to go. This ensures the internal O-ring seats properly.
3. Use the Right Tool for Press
   If you’re using ProPress, maintain your press tool properly and select the correct jaw size for the fitting. Inspect O-rings for any visible damage before pressing.
4. Follow Manufacturer Guidelines
   Each brand has recommended steps. For instance, Quick Fitting has a multi-function tool for marking depth and reaming the pipe. Rigid, Viega, and other brands offer guidelines on press durations and tool calibration.
5. Don’t Exceed Temperature or Pressure Ratings
   All fittings have maximum service limits. While you likely won’t approach 2000 psi, you might in some industrial or specialized applications. Check product data if you’re pushing the envelope.

Frequently Asked Questions

Q: Can push fittings be buried?
A: Many push fittings are rated for burial when wrapped or protected according to the manufacturer’s guidelines. Always confirm local code requirements.

Q: Should I rely on push fittings behind walls?
A: This is debated. Plenty of pros do so without issues, especially with reputable brands. Others prefer ProPress or solder for behind-wall plumbing to reduce any future risk of O-ring failure.

Q: Are there different O-ring materials?
A: Yes. EPDM is common for water applications, while other elastomers might be used for gas or chemical lines. Confirm you’re using the correct fitting for your fluid media.

Q: Will freezing temps compromise these fittings?
A: Frozen water can expand and potentially damage any pipe or fitting. PEX-based lines handle freezing better than copper. The fitting itself might or might not fail under freeze expansion, so best practice is to insulate and protect lines from freezing conditions.

Conclusion

ProPress vs Push Fittings | Pressure Test demonstrates that both categories can handle far more stress than what day-to-day plumbing demands. ProPress emerged with the highest single pressure reading, but the push fittings (Quick Fitting and SharkBite Max) also soared into impressive psi territory before letting go. In a residential setting where water pressure seldom surpasses 80 psi (and often stays below 60 psi), all three methods provide more than enough reliability—assuming proper installation.

For professionals, tool investment, speed, and client preference might determine whether you choose ProPress or push fittings. For DIYers, push fittings are often a godsend for speedy repairs without special equipment, though it’s essential to follow best practices to avoid user error. In the end, each method offers a strong, leak-free solution when used correctly. The biggest deciding factors often come down to cost, local plumbing codes, and personal comfort with the installation method.