Patented, improved closure makes assembly a snap. More pipe knockouts – 10 total, compatible with 1-1/2″ and 2″ pipe. Angled corner increases versatility. Zip ties included for rebar anchoring. Highimpact injection molded plastic. Use in concrete slabs, wood floors and multi-story flooring. Made in the U.S.A. Tub boxes by Benjamin Mfg. Constructed of high impact plastic. Will not fall apart when exposed to rain or water. Easily cut with utility knife for openings. Rodent proof. Can be used individually or in pairs.