The Green Drain 1.25" model is suited for pipes with diameters of 31-36 mm Simple installation - Please make sure to recess the Green Drain 2-4 inches into the drain to allow water to properly pass through it. Remember to push a screwdriver down through the Green Drain to ensure the silicone skirt is properly seated in the drain. 1.25-inch connection, 26 mm in height, with a 6 GPM flow rate This eco-friendly solution ensures a seamless flow of 6 GPM, making it a perfect fit for residential applications. This model’s affordability and effectiveness make it a popular choice, ensuring spaces remain clean and comfortable. G Green Drain holds a significant number of patents in both the plumbing and water conservation sectors, making us one of the most innovative companies in the industry today. Our eco-friendly products have been designed to improve or replace existing, poorly designed technologies that waste energy or have harmful effects on the environment., Weight: 0.04188782978 pounds, Manufacturer: Green Drain Inc.