We've been unable to get the back cover off the current motor to find out - the beast is straight out rusted on. But I realized what this could be - at one point in life prior to us living here, the owners had a hot tub. I think when they got rid of it, he pulled the motor from the hot pump and just threw it in the box in the basement. I was hoping he bought it for the pool, with the expectation of swapping out the existing old pump motor and just never got around to it but I feel as if my expectations were too high :-(