New and never opened, Farm Innovators Rubbermaid Drain Plug De-Icer. Designed to use with Rubbermaid stock tanks and water troughs, installs in drain plug. 1500 watts, accommodates any Rubbermaid water tank with drain plug, the one that I have currently plugged into my horses’ 150 gallon outdoor water trough kept it ice-free last night when it was -22 degrees with windchill. Winter is so lovely. We switched all but one water tank this year to those little sinking ones because the husband was cranky about the electricity bill and those ones are only 1000 watts, (I hate them because I’m convinced they’re 1) going to get yanked out and stomped upon and 2) don’t work as well, but this morning those waters had a little bit of ice in them but didn’t completely fail,) so I’m (begrudgingly) selling one of my two backup drain plug heaters.