Resistant to various acids (H2SO4, HCl , HNO3, HF, HClO4, aqua regia etc.), resistant to alkali and various corrosive gases. Removable, easy to install, and can be rotated 360°, with metal frame and anti-corrosion coating. An acid channel is installed to prevent liquid from spilling and injure experimenters, to ensure the safety. The PVC bottom plate is corrosion-resistant and easy to clean. It can be customized as needed and can be used with customized orifice plates. The hole diameter and depth can be customized as request for safety and preventing tipping.