Zurn - 1" Repair Kit Rubber Only For 375 RPZ

The Zurn Wilkins RK1-375R Repair Kit is a comprehensive replacement solution for 1” Model 375, 375XL, and 375ST Reduced Pressure Principle Assemblies. Designed to restore full performance and reliability, this kit includes key internal rubber components and O-rings for both check valves and the relief valve. It’s ideal for contractors seeking fast, efficient repairs while remaining compliant with lead-free regulations.

Key Features:

• Compatible with 1" Zurn Wilkins 375, 375XL, and 375ST backflow preventers
• Lead-free law compliant—safe for potable water applications
• Includes No. 1 and No. 2 check valve rubber parts, and relief valve internals
• All required O-rings and lubricant included for a complete seal
• Prevents leaks and restores pressure performance to factory standards
• Ideal for annual maintenance or system repairs

Technical Specifications:

• Application: Repair kit for 1” Reduced Pressure Principle Assemblies
• Models Supported: Zurn Wilkins 375, 375XL, and 375ST
• Included Components: No. 1 and No. 2 check rubbers, relief valve seal components, O-rings, lubricant
• Compliance: Meets Lead-Free Law (ANSI/NSF 372)
• Certifications: ASSE® 1013, CSA® B64.4, AWWA C511
• Installation: For use by certified professionals following Zurn repair instructions

Installation & Application:

• Recommended Uses: Commercial and residential potable water systems
• Installation Method: Internal repair of backflow preventer valve bodies
• Tools Required: Basic hand tools and included lubricant
• Typical Maintenance Interval: Annually or as needed based on inspection

Compatibility & Optional Accessories:

• Compatible Assemblies: Zurn Wilkins 1" 375, 375XL, 375ST
• Optional Add-Ons: RK1-375BOF (blowout fitting kit), enclosure kits, test kits
• Use With: OEM factory parts only for guaranteed fit and performance