I already had a 5000W portable generator which conked out when we needed it most during the great CT blackout in Oct. end of 2011. So i bought a 7500W portable generator as insurance, only to realize that it had a different input plug and needed this type of adaptor to connect with our house power back-up system. Well, this adaptor was the only one I could find, being sold for a pricey $70 plus. (On the other hand the local dealer was charging significantly more, as I think it is a low volume product.) But at least it has worked exactly as promised and needs simply to be plugged in at both ends. We've now had it for 10 months and have had no problems.
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