Functions: (1) Insect prevention (2) Anti-odor, deodorant (3) Leak prevention Features: (1) Easy to install, plug and play (2) Fast drainage (3) Adjustable size (4) Automatically opens during drainage and closes after drainage Working Principle: (1) When water flows into the floor drain, the water's gravity opens the bottom of the ABS gasket, allowing water to drain smoothly (2) After water flow stops, the ABS gasket automatically closes due to gravity, creating a complete seal to prevent pipeline gases, pests, and overflow from rising Material: ABS, Metal Applications: Fits holes from 3.3 to 4.5 cm Specifications: - Easy to install, plug and play - Fast drainage - Adjustable size - Automatically opens during drainage and closes after drainage Package Included: 1 x Floor drain core 1 x Fixed reduction ring Notes: 1. Slight measurement differences may occur due to manual measurement 2. The actual color may vary slightly from the images due to monitor brightness or lighting conditions during photography Thank you for your understanding