Zurn Wilkins RK34-975XL Repair Kit | 3/4" & 1" 975XL / 975XL2 RPZ Models.

Product Overview:

Restore peak performance to your Zurn 975XL or 975XL2 Reduced Pressure Principle Assembly (RPZ) with the Zurn RK34-975XL Complete Repair Kit. Designed for 3/4" and 1" models, this all-in-one solution includes everything needed to rebuild and maintain your backflow preventer — ensuring ongoing compliance, reliability, and system integrity. Whether for routine maintenance or emergency repairs, this genuine Zurn repair kit is engineered for a precise fit and long-lasting performance.

Features & Benefits:

• Complete Internal Kit: Includes essential components to fully restore check assemblies and the relief valve

• Compatible Fit: Designed for 975XL & 975XL2 models in 3/4" and 1" sizes

• Genuine Zurn Parts: Manufactured to original factory specifications for reliable performance

• Cost-Effective Maintenance: Avoid full unit replacement with this comprehensive rebuild kit

• Simple Installation: Components are pre-sized and compatible for straightforward servicing

• Ideal for Proactive Upkeep: Keep your RPZ assembly operating at optimal protection levels

What's Included:

• (2) 136N O-Ring Covers – Seals check covers securely

• (2) 952-300S Poppet Assemblies – Replaces internal check valve elements

• (1) 972-33 No. 1 Check Spring – Restores first check valve performance

• (1) 952-33 No. 2 Check Spring – Restores second check valve performance

• (1) 972-50S Relief Valve Stem Assembly – Ensures proper relief operation

• (1) 972A-33 Relief Valve Spring – Maintains correct relief valve tension

• (1) RK34-975XLSK Seat Repair Kit – Repairs wear on internal seats for tight seal integrity

Compatible Models:

• 975XL: 3/4" (34-975XL), 1" (1-975XL)

• 975XL2: 3/4" (34-975XL2), 1" (1-975XL2)

Installation Tips:

• Shut off water supply and relieve pressure before servicing

• Follow Zurn manufacturer instructions for disassembly

• Inspect internal seats and sealing surfaces before installing new components

• Reassemble in reverse order and test for leaks post-installation

• Consider periodic maintenance scheduling based on water quality conditions

FAQs:

Q: Can this kit be used for both 3/4" and 1" models?
A: Yes, it is designed to fit both 3/4" and 1" 975XL and 975XL2 assemblies.

Q: Is this a genuine Zurn OEM kit?
A: Absolutely, all components are manufactured to Zurn’s factory specifications.

Q: Do I need special tools to install this kit?
A: No special tools are needed, but standard plumbing tools and test equipment are recommended.

Q: Will this kit fix a leaking backflow preventer?
A: In many cases, yes — this kit replaces worn internal components that commonly cause leaks.