It is suitable for standard 1.57 (40mm) to 1.97" (50mm) pipe. Please measure the pipes you want to use before buying to ensure that you can buy a suitable floor drain. There are two fixed rings that can meet the different needs of large and small pipes. The automatic shut-off design prevents sewage gases from creating foul odors and tastes, stops sewage from backing up, and also allows water to drain easily. Installation is very easy, simply place it directly into the downspout. If the silicone part is too long, you can trim the flat bottom for fast drainage. The floor drain is made of high quality silicone, which is environmentally friendly, durable, stretchable, no need to worry about deformation, and super flexible. It works in most toilets, bathrooms, kitchens, basements and laundry drains. After installation, your room will be free of odor. Breathe fresh air and enjoy the good life.