Description: Effective Backflow & Odor Prevention: Say goodbye to nasty odors and messy backflow from your kitchen sink or floor drain. This sewer check valve Odor Blocker ensures water and unpleasant smells flow out but never come back in, keeping your kitchen fresh and clean Sturdy Construction: Crafted with pp, this drain backflow preventer ensures durability while effectively blocking unpleasant sewer odors Versatile Use: Drain Backflow Preventer provides a secure and reliable seal for your kitchen sink, drain pipes, or sewer line Easy Horizontal Installation: For optimal performance in household drainage, this valve MUST be installed horizontally Reliable: Engineered for reliability, the valve operates on a simple yet effective gravitation principle. The flap opens smoothly under the pressure of draining water and closes automatically once the flow stop Wide Application: Deodorant Cover provides immediate protection for your home's drainage system, ideal for bathrooms, kitchens, and basements Specification: Material: PP   Size Chart:Inner Diameter: 5cm/1.97inch Package Includes: 1 Piece Drain Backflow Preventer 1 Clamp Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.