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The WILKINS RK4-350 is a rubber and checks rubber repair kit. The kit contains (2) seal rings and (10) O-rings. It is used on 2-1/2 to 4 inch backflow preventers and is compatible with models 350/350A/375/450/475. This lead-free kit provides long-lasting protection from polluted water entering the potable water supply.
The RK4-350 repair kit provides cost savings by avoiding full replacement and is designed for long-lasting parts replacement.
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