The Complete Guide to Viega ProPress® Press Systems

Whether you're designing a system, managing a project or installing pipe, every connection impacts schedule, performance and long-term reliability. Viega ProPress helps teams move faster, reduce risk and install with complete confidence across plumbing, mechanical and industrial systems.  It’s one of the most trusted copper and stainless steel press systems in the industry, and for good reason. With over 1,000 approved applications, ProPress gives you the flexibility to take everyday plumbing, complex industrial installs and more with our one-tool system.

If you’re looking to work faster, safer and smarter, here’s everything you need to know about ProPress.

What Is Viega ProPress?

ProPress is a press fitting system that lets you connect copper or stainless steel tube in seconds without soldering, brazing or welding. Designed for commercial, industrial and residential applications, ProPress connections can be made wet or dry in seven seconds or less, and features like Smart Connect® technology help identify unpressed connections during testing. Get the full system overview here.

Why Do Pros Choose ProPress?

• Press On Wet & Live Systems: Reduce downtime and keep projects moving without having to shut down or purge systems.
• Smart Connect Has Your Back: Every fitting comes with Smart Connect technology so that you can identify unpressed connections 100% of the time.
• Delivered Confidence: Consistent installation quality from project to project with faster delivery and less disruptions. Backed by extensive approvals and code compliance.
• Broad Application Coverage: With more than 1,000 approved applications and over 400 fitting configurations, ProPress supports potable water, hydronics, compressed air, fuel, gas and specialty process piping.
• Reliable Support & Training: Viega provides hands-on product training and ongoing customer support to help you press with complete confidence.

ProPress Copper Fittings & Valves: Your Everyday Go-To

ProPress copper fittings are engineered to perform across a wide range of residential, commercial and light industrial applications, including data centers, multi-family housing, schools and more.

Key Specs

• Sizes: ½" to 4" CTS
• Temperature: 0°F to 250°F
• Pressure: Up to 300 PSI
• Sealing Element: EPDM standard (FKM + HNBR options available)

Listings and Certifications

• ProPress systems are listed under ASTM F3226 and included in ASME B31.1, B31.3 and B31.9 referenced standards, providing engineers and contractors greater confidence for industrial and mission-critical applications.
• NSF®-61
• NSF®-372
• IAPMO/ANSI/CAN Z1117
• ICC-ES IC1002
• ABS
• CSA Low Lead Content
• ASME B16.51
• FM Class 1920

What Applications Are ProPress Copper Fittings Approved For?

With more approvals and fitting configurations than any other copper press system, ProPress Copper provides the flexibility to standardize installs across more projects and applications. View the full approved applications chart to see compatible media, operating conditions and system details.

Water/Liquids

• Hot and cold potable water
• Rainwater/ Graywater
• Chilled water
• Hydronic heating (with glycol)
• Low-pressure steam (15 psi maximum) with FKM sealing element swap
• Residential steam (5 psi maximum)

Fuels/Oils/Lubricants

• Ethanol

ProPress Copper can also be used in underground applications (with proper authorization based on local codes) and in concealed spaces.

ProPress 316 Stainless: Built for Tough Environments

When the job gets more demanding, ProPress stainless steel fittings deliver durable performance. Designed for corrosive conditions and industrial systems, XL fittings (2½″ to 4″) feature a stainless steel grip ring and PBT separator ring, while smaller sizes (½″ to 1½″) feature an EPDM sealing element. When paired with lightweight, CTS-compatible ProPress 316 ECO Tubing, the system provides a cost-competitive stainless steel alternative for potable water, air, acidic and cleaning solution applications.

Key Specs

• Sizes: ½" to 4" CTS
• Temperature: 0°F to 250°F
• Pressure: Up to 200 PSI
• More than 350 different fitting configurations.
• Sealing Element: EPDM standard (FKM + HNBR options available)

Listings and Certifications:

• ABS
• IAPMO/ANSI/CAN Z1117
• ICC-ES LC1002
• NSF®-61
• NSF®-372

What Applications Are ProPress Stainless Fittings Approved For?

ProPress stainless steel fittings are designed for systems that demand cleanliness and corrosion resistance, such as food and beverage, pharmaceutical, marine and other applications.

Water/Liquids

• Hot and cold potable water
• Hydronic heating (with glycol)
• Chilled water
• Low-pressure steam (15 psi maximum) with FKM sealing element swap
• Residential steam (5 psi maximum)

Gases

• Compressed air
• Non-medical gases
• Vacuum (29.2" Hg maximum 68°F)

Special Media

• Isopropyl alcohol
• Latex paint
• Phosphoric acid

What Types of Valves Are Available for ProPress Systems?

Viega ProPress features a full lineup of valves, including ball, check, butterfly and balancing valves, with the same approved applications, durability and features (like Smart Connect) for consistency across your entire build. Explore the full valve lineup here.

Why Are More Pros Switching From Soldering To Press?

Switching to press technology means:

• Faster installs
• No open flame
• Fewer safety concerns
• More consistent results
• Less labor, more productivity

It’s not just easier. It’s better for your business.

Beyond the Product: The Viega Difference

When you choose ProPress, you’re just choosing a press system. You’re gaining access to:

• Technical support teams
• Application guidance
• Product training
• Continuing education opportunities
• Field support resources
• Decades of press technology expertise

Ready to Get More Done with ProPress?

If you want faster installs, fewer risks and consistent results, Viega ProPress systems deliver. And if you’re not sure what’s approved for your application, Viega’s technical team can help.