Some use fine stainless‑steel mesh that catches food, grease, and hair while letting water pass. Others use a removable perforated or food‑safe polypropylene basket that captures scraps but allows drainage through holes.
Some multi‑function catchers combine a strainer and stopper in one unit. Common mechanisms are pop‑up or press actions and twist tabs that switch between sealing the drain to hold water and opening to drain while still trapping scraps.
Most designs are emptied by lifting out a removable basket and dumping or rinsing it. Silicone catchers are often flipped or inverted so debris falls out. Several models emphasize quick lift‑out or flip‑inside‑out actions for easy cleaning.
Rust‑resistant stainless steel construction (often 304 stainless in listings) and overall durable materials and solid construction are the most commonly cited features that improve longevity.
Many catchers are designed to fit kitchen, bathroom, and utility sinks and some specify compatibility with standard 3.5‑inch kitchen drains (openings around 3 to 3.38 inches and certain depth requirements). A few notes say they can be used with garbage‑disposal openings but should be removed before running the disposal.