Adequate drain pipe diameter is 39mm (3.9cm)-44mm (4.4cm) Insect prevention, anti-odor, anti water leakage and overflow, prevent water leakage from saving the room The body grid seal is designed in v-cup shape, ensure the good drainage and water flow; The shower drain gasket is made of good quality silicone, completely eco-friendly material; odorless and non-toxic; preserve health for the whole family; fast-draining, automatic opening when draining, closing when draining. Product description Size: 9.2 x 5 x 5cm The escape trap is made of durable silicone. The body shape is v-cup. The mouth of the filter shower tube can automatically open and close under the effect of gravity water, guarantee both drainage and the function of protecting against insects, odors and discharge gas wastewater. After draining, the fly drainage closes automatically to keep bacteria and mites out. Installation guide: 1. Please accurately measure the inside diameter of the exhaust vent, in a case any inconvenience carried by a size 2. Measure the depth of the tube 3. install the floor drain a one-way valve 4. Because the glue and the characteristic softness of silicone, make sure the stand apart drain grate mouth with your hands in the first smooth installation for drainage Package contents: 3 * drain check valve 3 * Anti-Rust Steel Filter 3 * Steady Steel Ring