Protect your home from costly sewage backflow with the Sewer Popper Cleanout & Relief Valve. This 3" x 4" pressure relief device fits securely into a 4" cleanout pipe and opens automatically when pressure builds up due to a blockage. No tools or adhesives are needed—just push it into place for instant protection. Ideal for use with septic systems and municipal sewer lines, this reliable and durable solution is trusted by plumbers and contractors across the country.