Both of these are high efficiency compressors designed for demanding industrial applications. Retail value for either of these range from $1150-$2150 brand new. I am willing to give them up for a huge discount as they are open box and I simply don't have a use for them. Either $550 each if buy only 1 or take both for $1000. That is a steal based on the low end of the range and they are brand new. Absolutely nothing wrong with them despite open box.