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The Braxton Harris COMPANY SRV312 3-1/2'' Sewer Relief Valve is designed for use in outside cleanouts to eliminate costly damage due to sewage back-up. It fits 3-1/2'' cast iron or plastic pipes and provides a visible warning that sewage is backing up. Spring loaded to automatically close, preventing sewer gases from escaping.
Sewer relief valve designed to prevent sewage backup and sewer gas leaks in 3-1/2'' pipes.
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