I wonder if anyone can help. On our last weekend break, we had a blockage in our sink. Thinking we could find where the blockage was, we looked behind the fridge vent outside. The fridge is directly under our sink, so logic told us that we may find a solution there. Unfortunately we did not, and my husband managed to over tighten the plastic plug which holds the vent in place and it broke! Does anyone know where we may be able to find a replacement plug or, worse case scenario, a new vent? I have tried all sorts of places but I am having no luck. Any help or advice would be gratefully received. Thanks.