Zurn Wilkins RK212-350CK1 Backflow Preventer First Check Assembly Repair Kit (3507-300) for 2-1/2" and 3" 350/350DA/450/450DA

Zurn Wilkins RK212-350CK1 DCVA Backflow Preventer First Check Assembly Repair Kit – 2-1/2" & 3".

Product Overview

The Zurn Wilkins RK212-350CK1 is a genuine OEM first check assembly repair kit designed for 2-1/2" and 3" Zurn Wilkins backflow preventers. Built specifically for the 350, 350DA, 450, and 450DA series, this kit contains all the essential components needed to restore the #1 check section, ensuring reliable backflow prevention and continued code compliance.

Using the RK212-350CK1 helps extend the service life of your backflow preventer, saving on costly replacements while maintaining dependable protection against backsiphonage and backpressure in potable and non-potable applications.

Features & Benefits

• OEM Certified – Genuine Zurn Wilkins replacement parts for guaranteed fit and performance.

• Complete Repair Solution – Includes all necessary components for rebuilding the first check assembly.

• Compatibility – Designed for 2-1/2" and 3" Zurn Wilkins models 350, 350DA, 450, and 450DA.

• Long-Lasting Materials – Corrosion-resistant elastomers and hardware ensure extended service life.

• Maintains Compliance – Keeps your backflow preventer performing to required standards for inspections.

Kit Contents

• Seat Retainer #1

• O-Ring – Seat

• Nut – Poppet Retainer

• Washer – #1 Check

• O-Ring – Stem

• Poppet Retainer

• Seal Ring

• Seat Assembly – #1 Poppet (3507-300)

Compatibility

This repair kit is designed for the following backflow preventers:

• 212-350, 212-350DA

• 3-350, 3-350DA

• 212-450, 212-450DA

• 3-450, 3-450DA

Important Note:

• Does not repair "A" style bodies (e.g., 212-350A).

• Does not repair "AST" style bodies (e.g., 212-350AST).

Installation Tips

• Shut off water supply and relieve system pressure before beginning.

• Follow Zurn Wilkins repair instructions for proper assembly sequence.

• Apply approved lubricant to O-rings during installation.

• Always test the backflow preventer after servicing to ensure correct operation.

FAQs

Q: What does this kit repair?
The RK212-350CK1 rebuilds the #1 check section of Zurn Wilkins 2-1/2" and 3" 350, 350DA, 450, and 450DA backflow preventers.

Q: Can this be used on “A” or “AST” style models?
No. This kit is not compatible with “A” or “AST” body style preventers.

Q: How often should the check assembly be serviced?
Annual inspection is recommended. Service may be required sooner if the unit fails a backflow test.