Wilkins RK34-375 Complete Repair Kit for 3/4 in. 375 Series

The RK34-375 Complete Repair Kit provides all internal components required to service Wilkins Model 375, 375XL, and 375ST reduced-pressure backflow preventers in 1/2 in. to 3/4 in. sizes. This genuine Zurn/Wilkins kit restores check and relief valve performance and helps maintain reliable operation during routine testing and maintenance.

• Compatibility: Designed for Wilkins 375, 375XL, and 375ST assemblies in 1/2 in.–3/4 in. pipe sizes.
• Complete contents: Includes #1 and #2 check modules, relief valve stem assembly, relief valve seat and spring, and lubricant.
• Seals and hardware: All necessary O-rings, sleeve and housing seals, and cover hardware to replace worn rubber components.
• Service benefits: Restores proper sealing, reduces leakage risk, and helps the device meet performance requirements after repair.
• Documentation: Manufacturer replacement parts list and installation/maintenance manuals are available for reference and field service guidance.
• Installation note: Kits should be installed by qualified personnel following local codes; test and verify device operation after service.

Every component in the RK34-375 is selected to match factory specifications so technicians can complete repairs without sourcing multiple parts. For model-specific diagrams, part numbers, and installation instructions consult the included documentation or the manufacturer’s technical literature.