Design: This pop-up design is more convenient and flexible than the previous pop-up. Just gently press the top cap to switch between 2 modes: stopper (to keep water in) and strainer (to drain water away). Function: Unlike ordinary push button drain, this drain has an anti-clogging basket strainer inside which neatly collects hairs, ensuring efficient filtering. Material: This drain plug is made of high quality stainless steel and thickened copper, anti-rust, anti-cracking, has good airtightness and good drainage. Applications: This pop-up filter drain plug can be used for various types of pond draining. The inner diameter of the drain plug is 34mm. Suitable for drain holes with an inner diameter of 35mm to 38mm. Package includes: You will receive 1 drain plug, if you have any questions, please contact us.