3-inch Sewer Cleanout Cap — high-grade rubber body with reinforced metal components and stainless steel wing nuts for dependable sealing and long service life. Key benefits Prevents leaks and pipe damage: Expands to form an airtight seal that stops water intrusion, debris, and external blockages from entering cleanouts, sink pools, and pipe entries—reducing the risk of pipe breakage and costly repairs. Faster, safer maintenance: Fully assembled and tool-free to install and remove, so you can secure drain inlets and return lines quickly during repairs, testing, or seasonal closures. Durable and stable: High-grade rubber provides a reliable expansion seal while robust metal construction and stainless steel wing nuts replace weaker plastic fittings for improved stability and longer life. Features and performance Size: 3-inch cleanout cap, ready to fit common 3" drain and return openings. Materials: High-grade rubber seal and reinforced metal body with stainless steel wing nuts for corrosion resistance and repeated use. Function: Expansion plug design creates a tight, airtight seal for blocking water, debris, and pressure leaks; useful for pressure testing and routine plumbing maintenance. Compatibility: Works with most standard piping systems used in kitchens, bathrooms, pools, and utility areas. Practical applications Pool winterization: Seal return lines and inlets to prevent water backflow and debris intrusion during winter or when the pool is out of service. Renovation and repair: Temporarily cap sink drains and cleanouts during plumbing work to keep debris out and protect piping from accidental damage. Pressure testing and maintenance: Use as a reliable plug when pressure-testing lines or isolating sections of plumbing in residential and commercial settings. Why choose this cap Ready-to-use, no assembly required. Replaces plastic fittings with stainless steel wing nuts for improved grip and durability. Designed to protect plumbing infrastructure and simplify maintenance tasks without extra tools or complicated installation.