I have an overflow pipe (standard diameter 21.5mm) sticking out through a hole in a white uPVC fascia board at our house, but the overflow pipe is no longer required and could be removed. However, before removing it, I need some way of capping the hole - a white barrel plug, for example. Does anyone know of any supplier who could sell me just one cap/plug? There are a number of online suppliers but, invariably, there is a minimum order quantity or value.