PREMIUM MATERIALSThe cover features 304 stainless steel and multilayer chrome finish, efficiently resistant to scratches, corrosion and rust. Durable and high-quality silica gel help to store water well and prevent water leakage. SMART DRAINAGE SYSTEMWater can be drained off more quickly than normal pop-up wastes. With the overflow hole of the sink, it can prevent water from overflowing the wash basin and flooding your floor. CONVENIENT OPERATIONSimply press the cover to fill or drain off water, much easier than traditional pull rod or other wastes. Besides, you can turn the upper cap counter-clockwise to unscrew and clean. UK STANDAR SIZEG1 1/4 BSPP threaded waste. Height: 87mm. Waste Diameter: bottom 40mm. The installation is easy due to its upgraded simple construction. The photos and product description on this page exhaustively mention how to install. You can totally install it by yourself, saving money of hiring a plumber.