Why the Zurn Wilkins 4-375AST 4" RP Assembly Is the Best Choice for Backflow Prevention in Commercial Plumbing

🔧 Everything You Need to Know About the Zurn Wilkins 4-375AST 4" Reduced Pressure Principle Assembly

When it comes to protecting your potable water supply from contamination, choosing the right backflow preventer is non-negotiable. One standout option trusted by contractors, engineers, and facility managers alike is the Zurn Wilkins 4-375AST — a robust, stainless steel Reduced Pressure Principle Assembly designed for heavy-duty commercial and industrial use.


What Is the Zurn Wilkins 4-375AST?

The Zurn Wilkins 4-375AST is a 4-inch Reduced Pressure Principle Backflow Preventer. Its main job is to stop contaminated water from flowing back into the clean water supply — a critical function for buildings that handle high-pressure potable water systems.

Equipped with a stainless steel body for superior corrosion resistance, this model comes with Non-Rising Stem (NRS) gate valves and flanged connections for secure, code-compliant installation.


🛠️ Key Benefits & Features

Why do so many plumbing professionals choose this model? Here’s what makes it stand out:

  • Durable Stainless Steel Body: Resists rust and corrosion, even in demanding conditions.

  • NRS Gate Valves: Compact, easy-to-operate shutoff valves that won’t interfere with tight spaces.

  • Flanged Ends: Provide a tight, secure fit for commercial piping systems.

  • Zurn Wilkins Reliability: Backed by decades of proven performance and trusted engineering.

  • Code Compliance: Meets industry standards for safe backflow prevention in commercial and municipal water systems.


🔍 Where Is the Zurn 4-375AST Used?

This assembly is perfect for:
✔️ Office buildings
✔️ Schools and universities
✔️ Hospitals and health care facilities
✔️ Industrial sites
✔️ Municipal water supplies
✔️ Anywhere clean water safety is a must!


⚙️ Installation Tips

While every job is unique, here are some tips to get the best results:

  • Install in a location that allows easy access for inspection, testing, and maintenance.

  • Ensure proper clearance around the valves and test cocks.

  • Follow local plumbing codes and consult with a certified installer if needed.


💡 Maintenance Matters

Like all backflow preventers, the Zurn Wilkins 4-375AST requires periodic testing and maintenance to ensure it continues to protect your water supply. Routine inspections help detect leaks, worn seals, or debris that could impact performance.


Frequently Asked Questions

Q: What does “RP” mean?
A: RP stands for Reduced Pressure Principle Assembly — a type of backflow preventer designed for high-hazard situations where both backpressure and backsiphonage may occur.

Q: Why choose stainless steel?
A: Stainless steel offers superior corrosion resistance compared to standard ductile iron, making it ideal for harsh environments.

Q: What are NRS gate valves?
A: Non-Rising Stem (NRS) gate valves keep the stem within the valve body, saving space and reducing exposure to weather or tampering.

Q: Does it come with flanged ends?
A: Yes! The flanged x flanged design ensures a secure, bolt-on installation.


🚀 Protect Your Water. Protect Your Business.

When you choose the Zurn Wilkins 4-375AST, you’re investing in industry-leading protection for your water supply — peace of mind that your system meets all safety standards, backed by a name you can trust.

Ready to upgrade your backflow prevention system? Browse our full selection today and keep your water safe and clean for everyone.