E-cowlboy

RK34-375 Backflow Preventer Repair Kit Compatible with ZurnWilkins 375 375XL 375ST 1 2 3 4 Models Includes Check

4.2(8)
$41.99

190+ bought in the past month

About this item

  • Complete RK34-375 Repair Kit – This premium RK34-375 complete repair kit is specifically designed to restore for 375, 375XL, and 375ST backflow preventers. It includes everything needed for full valve repairs, all in one box.
  • Exact OE Replacement – Matches RK34-375 & RK34-375R:Fully replaces original RK34-375 and RK34-375R parts. Designed with precise dimensions for a flawless, secure fit.
  • Trusted by Professionals – Recommended for Reliable Repairs:Widely used by certified plumbers and contractors, this backflow preventer repair kit is trusted for its efficiency and quality.
  • Strong Compatibility – Fits 1/2" & 3/4" Valve Sizes:This 375 RP repair kit is compatible with both 1/2" and 3/4" valves, offering versatile application for a range of pipe systems.
  • Fix Leaks & Save Money – Avoid replacing the entire backflow preventer. This repair kit solves leak issues directly, saving on costly replacements and extending your valve's service life.
  • DIY-Friendly Installation – No Special Tools Required:Even without plumbing experience, this kit allows fast and easy repairs with simple instructions and pre-assembled parts. Ideal for both pros and DIYers.
  • Built to Last – High-Quality ABS, Rubber & Stainless Steel:Engineered using corrosion-resistant ABS, premium rubber, and steel components, this 375XL repair kit is built for high-pressure, long-term performance.
  • Warranty Included for Peace of Mind: All products come with a 12-month warranty against quality-related issues and a 30-day money-back guarantee, ensuring that you can buy with confidence. Our dedicated customer service team is ready to assist you.
$41.99

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Technical specifications
manufacturerE-cowlboy
item_weight4.2 ounces
product_dimensions1 x 1 x 2 inches
item_model_numberRK34-375 / RK34-375R
colorBlack
included_componentsRK34-375 Backflow Preventer Repair Kit
batteries_includedNo
batteries_requiredNo
best_sellers_rank#69,278 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #49 in Toilet Repair Kits #6,183 in Kitchen & Bath Fixtures
date_first_availableMay 16, 2023

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Customer reviews

4.28 ratings
  1. 580%
  2. 40%
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  5. 120%
★★★★★

well packed

CustomerFebruary 21, 2026✓ Verified purchase

great product. did the job. well packed and included everything that needed for the job Read more

★★★★★

Far better option than paying a plumber to do the job.

joshuaDecember 21, 2025✓ Verified purchase

Factory replacement parts, for a pretty straight forward repair. Save yourself $500 and DIY. Read more

★☆☆☆☆

Stay away!!!

MauitechMarch 18, 2026✓ Verified purchase

Stay away from this repair kit! These parts are cheap Chinese knock-offs that will not function properly. I rebuilt my backflow preventer using these parts and when the technician came to test the unit, it failed. He disassembled the unit and said I had done everything correctly but that the springs on the check valves were way too stiff and were preventing them from working properly. I ended up spending $450 for him to rebuild the backflow preventer with an original Zurn / Wilkins kit that worked perfectly. The difference in the spring tension between the two was immediately obvious. Save yourself a bunch of grief and just buy the actual Zurn / Wilkins kit! Read more

★★★★★

Lay out all the parts and verify they match

B. BaezSeptember 19, 2025✓ Verified purchase

Perfect fit and no more leaking. Parts looked exactly like the original except body ends on original had flat washers. The o rings worked just as well. I used NSF approved silicone paste on o rings. Read more

Review image 1
★★★★★

Backflow repair kit

Elaine LamSeptember 19, 2025✓ Verified purchase

This is an aftermarket product but it fit perfectly. I will buy it again. Read more

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