Zurn Wilkins RK4-350CK2 Backflow Preventer #2 Check Assembly Repair Kit

Zurn Wilkins RK4-350CK2 Backflow Preventer #2 Check Assembly Repair Kit.

Product Overview

The Zurn Wilkins RK4-350CK2 #2 Check Assembly Repair Kit is a genuine replacement kit designed to restore the performance of your Zurn Wilkins backflow preventers. Built to OEM specifications, this kit ensures your assemblies continue to provide reliable protection against backflow and meet local compliance requirements.

The RK4-350CK2 includes all the necessary parts to service the #2 check assembly, including the check component, retainer clip, and lubricant for proper installation. Compatible with a range of Zurn Wilkins double check (DC) and reduced pressure principle (RPZ) backflow preventers in 2-1/2", 3", and 4" sizes, this kit is trusted by plumbing professionals for quick, cost-effective maintenance.

Features & Benefits

• Genuine OEM Repair Kit – Ensures a perfect fit for Zurn Wilkins backflow preventers.

• Complete Kit – Includes #2 check assembly, retainer clip, and installation lubricant.

• Wide Compatibility – Fits multiple 2-1/2", 3", and 4" Zurn Wilkins models.

• Restores Functionality – Replaces worn components to maintain accurate backflow protection.

• Cost-Effective Maintenance – Extends the life of existing assemblies without full replacement.

• Durable Materials – Built with corrosion-resistant components for long-lasting reliability.

Specifications

• Kit Model: RK4-350CK2

• Application: #2 check assembly replacement

• Sizes: Fits 2-1/2", 3", and 4" assemblies

• Compatible Zurn Wilkins Models:

  • 2-1/2" & 3" Valves: 212-375A, 212-375AOSY, 212-375ADA, 212-375ADAOSY, 3-375A, 3-375AOSY, 3-375ADA, 3-375ADAOSY

  • 4" Valves: 4-375, 4-375OSY, 4-350, 4-350OSY, 4-475, 4-475OSY, 4-450, 4-450OSY

Installation Tips

• Shut off the water supply and relieve pressure before servicing.

• Remove existing worn check assembly and install replacement components.

• Use included lubricant to ensure smooth installation and proper sealing.

• Reassemble and perform a backflow test to confirm compliance.

• Professional installation recommended to meet code requirements.

FAQs

Q: What does this repair kit include?
A: It includes the #2 check assembly, retainer clip, and installation lubricant.

Q: Which models does this kit repair?
A: It fits Zurn Wilkins 375A, 375ADA, 350, 475, and 450 models in 2-1/2", 3", and 4" sizes.

Q: Why replace the #2 check assembly?
A: Over time, check assemblies can wear or fail, preventing proper sealing. Replacing them restores backflow protection and ensures compliance.

Q: Can I install this kit myself?
A: Professional installation is recommended, as testing is required by code after repairs.