Note; this is a 1-1/4" P-Trap primarily used in bathrooms. Check your size before purchase. Expertly designed to securely fit onto the standard drain pipe below a bathroom sink, this eco friendly, innovative drain system is key to keeping your drains clog-free and the water system clean. The tight-seal screw cap allows you to reach those tough clogs without having to remove the the P-trap, while the ergonomic brush remains intact as a trap that catches hair, jewelry, toys and other small objects. Simply remove the cap and pull out the brush to clean the drain when needed. 
An effective option is to remove brush before installation and store brush nearby. Unscrew the cleanout cap and then insert brush to push/pull clog until clear. 
Minimizes the messy job of removing the entire trap that so often causes drips and leaks.