The Wilkins RK4-375ASTCK1 is a comprehensive #1 check assembly repair kit designed to restore first check valve sealing and operation in backflow preventers without requiring full unit replacement.

Key Specifications:

• Size: 2 1/2 to 4 Inches
• Kit Contents: Check assembly, retainer, lubricant
• Compatibility: Models 375AST, 375ASTDA, 475ST, 475STDA
• Function: First check valve repair
• Warranty: 1-year limited warranty

Other Related Variants:

• RK4-375ASTCK2: #2 Check Assembly Repair Kit

Materials:

• Check assembly components
• Retainer hardware
• Assembly lubricant

Typical Installation:

Used for repair and maintenance of the first check assembly in backflow prevention systems including commercial buildings, industrial facilities, irrigation systems, and potable water supply protection applications where Models 375AST, 375ASTDA, 475ST, and 475STDA backflow preventers are installed.

Standards Compliance:

Compatible with assemblies meeting ASSE 1013, USC FCCCHR, AWWA C511 standards for reduced pressure principle backflow prevention assemblies

Features & Benefits:

• Cost-Effective Repair: Allows repair without replacing entire backflow preventer, reducing maintenance costs and downtime.
• Complete Kit: Includes all necessary components—check assembly, retainer, and lubricant—for comprehensive first check valve restoration.
• Wide Compatibility: Fits multiple Zurn RK4-375ASTCK1 compatible models including 375AST, 375ASTDA, 475ST, and 475STDA in 2-1/2 inch to 4 inch sizes.
• Reliable Performance: Restores proper first check valve sealing and operation, ensuring continued backflow prevention system integrity and compliance.

FAQ

Q: What backflow preventer models is this Zurn RK4-375ASTCK1 repair kit compatible with?

A: This kit is designed for 2-1/2 inch to 4 inch Models 375AST, 375ASTDA, 475ST, and 475STDA backflow preventers.

Q: What components are included in this repair kit?

A: The kit includes the #1 check assembly, retainer hardware, and assembly lubricant needed for complete first check valve repair.

Q: Can I repair just the first check valve without replacing the entire backflow preventer?

A: Yes, this repair kit allows you to restore first check valve sealing and operation without replacing the entire backflow prevention assembly, saving time and cost.

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