Compatible with standard size: The sink extension with overflow is designed with a standard G 1¼ BSPP connection, suitable for drain pipes with a diameter of 41-55 mm (1.61-2.16 inches), making it suitable for most bathrooms and commercial sinks. Excellent material: The sink stopper is made of solid brass, and the solid brass spring cores have good rebound force. It is durable, not easy to rust, lead-free, harmless, and environmentally friendly. Stainless surface and rust-resistant for a lasting shine in your bathroom. Convenient use: Ainiv sink stopper only needs to be clicked down to block water, and clicked again to release the water. The stopper closes quickly and does so 10% faster than traditional stoppers. In addition, you can turn the top cap counter-clockwise to loosen and clean it. Only suitable for bathroom sinks with overflow. Double seal: Ainiv bathroom sink stopper has two high-quality silicone seals to create a double seal. It is durable, does not dry out, provides better sealing performance, and prevents water leakage. See product instructions (may not be in Swedish). Unique pop-up design: The bathroom sink stopper is sturdy and has a solid brass compression spring, which creates a quick seal and prevents leaks. Just press with your finger to quickly close or open the sink stopper, making it a convenient household accessory.