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Introducing the Watts Internal Backwater Valve 4 in Pipe Dia - a reliable and durable solution for preventing costly flood damage caused by backflow in your home or business. This valve features bronze and neoprene construction, making it suitable for harsh plumbing environments while ensuring long-lasting performance. Its compact design allows easy installation on 4-inch drain pipes, fitting seamlessly into most existing systems. The valve also helps maintain optimal pressure in your DWV system by allowing air to enter, and comes with an activated carbon filter that effectively eliminates unpleasant odors from drains and septic systems. Use it as an individual or stack vent to enjoy efficient and effective drainage, with the added benefit of reducing unwanted smells. Choose the Watts Internal Backwater Valve 4 in Pipe Dia for reliable protection and better-smelling plumbing.