http://dwiki.sintesysglobal.com/index.php?title=A-strainer-popularly-known-as-floor-drain-cover-or-floor-gratinggrate-should-always-be-used-all-the-time-to-cover-up-the-floor-drain-j for drain cover (grate) is manhole cover. Say "manhole cover" and images of spies/heros making use of the underground sewage system popping out of manhole cover in Hollywood films appear. Historically ever since Man invented the sewage system since the Roman Times to drain water and urban waste away for sanitation purposes, manhole covers (drain covers or grates as we would like to call them) have been invented out from the necessity in order to avoid people from falling into underground sewage and also to prevent large objects from entering the drains which cause choking which eventually may lead to flooding. Fast forward to the modern day, the sewage system is still being used under all cities around the world. Instead of the crude stone manhole covers the Romans used in the ancient days, today we have special steel reinforced stone gratings that provide http://www.internetblackout.org/index.php?title=Worlds-first-reinforced-decorative-stone-grating-Incorporating-the-beauty-of-stone-without-compromising-load-bearing-strength-the-marriage-of-aesthetics-and-performance-remained-unchallenged-in-the-market-m of covering the inlets of our sewage system. A lot more than a cover, check out http://wiki.kantakji.com/index.php?title=A-strainer-commonly-known-as-floor-drain-cover-or-floor-gratinggrate-should-always-be-used-at-all-times-to-protect-the-floor-drain-u of drain covers (drain gratings) here: http://www.jonite.us/products/creative-grates