Product review (5 stars): OEM style element that is easier to install
The element fits correctly in the guides of the model 1137 and stays in place when it is inserted from the bottom, making it easier to reinstall the bottom cover and not have the element fall out. In contrast with other manufacturer's elements, it has a perimeter frame with about 1/4" flanged edges, and has flow restriction holes in the bottom end of the frame which I assume help slow down the water flow rate and enhance the evaporation.