Our 2013 Serenity 23D came with a white circular cover for the sink. We never found a way to use this that matched our food prep style. So we just slipped the cover under the mattress and left it there. Last week we were visiting a woodworking friend and asked him to use his bandsaw and cut a section out of the cover. Wow, we now have a very practical cover that allows us to run the water and chop veggies (etc) with the cover in place, effectively doubling our counter space. Food scraps can be easily passed down into a bowl in the sink with the cover in place. Our friend, not wanting to waste anything, shaped the residual piece into a mini cutting board.