After Ye Great Burlington Fludde of August 2014 we decided that it would be crazy to waterproof the house and restore the basement without installing the back flow valve. It was a very tricky job in very cramped situation and awkward pipe setup. Peter Knight and his crew did an excellent job of installing the drain and I couldn't believe how tidy the job was. Money well spent I think. Really nice crew, polite and thoughtful. It was done in a timely fashion considering the huge rush of jobs being done after the flood.