Cockroach control traps are a common bathroom drain installation. Their purpose is to prevent cockroaches from encroaching bathrooms or any other place where it is installed. They function typically like all plumbing traps. It traps the right quantity of water, sufficient for cockroaches to not be able to enter and move up the drains while letting out the excess by using a combination of two filters. Material: Stainless Steel Dimensions (Approximate): Inner Diameter (Grating) = 10.5 cm Outer Diameter = 13 cm Height = 6.5 cm