Zurn Wilkins 38-ZW3870XLT Lead-Free Aqua-Gard Thermostatic Mixing Valve

Zurn Wilkins ZW3870XLT 3/8" Compression Aqua-Gard® Thermostatic Mixing Valves.

Product Overview

The Zurn Wilkins ZW3870XLT Aqua-Gard® thermostatic mixing valves (TMVs) are designed for point-of-use installation under sinks, lavatories, and sensor faucets to help prevent scalding. Engineered with rapid response and precise temperature control, these valves mix hot and cold water to deliver safe, consistent outlet temperatures between 95–115°F.

Available in two configurations:

• 38-ZW3870XLT: 3-port valve (hot in, cold in, mixed out) for single outlet applications

• 34-ZW3870XLT-4P: 4-port valve (hot in, cold in, cold out, mixed out) for multi-use installations

These valves are compact, reliable, and meet stringent ASSE 1070 standards, making them ideal for both residential and commercial use where lead-free compliance is required.

Features & Benefits

• Provides scald protection with accurate temperature mixing (±3°F)

• Compact size for easy installation under sinks and lavatories

• Lead-free construction for safe use in potable water systems

• Integral check valves and strainer screens for added reliability

• Nickel-plated bronze body ensures long-lasting durability

• Certified to ASSE 1070 and CSA, ensuring code compliance

Specifications

• Sizes: 3/8" compression connections

• Outlet Temp Range: 95–115°F (35–46°C)

• Hot Supply Temp: 120–195°F max (49–90.5°C)

• Cold Supply Temp: 40–75°F (4.4–23.8°C)

• Temperature Accuracy: ±3°F (1.78°C)

• Max Working Pressure: 145 PSI

• Max Pressure Differential: 15 PSI between hot & cold

• Flow Rate: 3.10 GPM @ 45 PSI pressure loss

• Minimum Flow: 0.35 GPM

• Materials: Nickel-plated bronze body, brass internals, polysulfone piston, Noryl guide tube, Viton seals, stainless steel springs, acetal checks

• Certifications: ASSE 1070, CSA Certified, NSF/ANSI 61 & 372

Installation Tips

• Install directly at the point of use for maximum scald protection.

• Use ball valves on both hot and cold supplies for serviceability.

• Flush supply lines prior to installation to prevent debris damage.

• Temperature must be field-set during installation to ensure compliance.

• For 4-port models, connect the cold outlet where additional cold supply is needed.

FAQs

Q: What’s the difference between the 3-port and 4-port models?
A: The 3-port is for single mixed outlets, while the 4-port provides a separate cold bypass outlet.

Q: Can this valve be used in commercial restrooms?
A: Yes, it’s certified for both residential and light commercial applications.

Q: Does this valve prevent scalding?
A: Yes, it ensures mixed outlet temperatures stay within 95–115°F.

Q: Is it lead-free?
A: Yes, it complies with NSF/ANSI 372 standards for low-lead content.

Q: Does it require regular maintenance?
A: Periodic inspection and flushing are recommended to maintain performance.