The one at the other house was 5hp too. Not 5 hp peak, but continous most likely like yours sleeper. I think it had a 80 gallon horizontal. The compressor head was a giant 2 cylinder with "DENVER" cast into it. Supposedly it came from the "Gates" factory here in Colorado. Yep, thats Gates as in Gates belts and hoses made right here in crazy *** weather Colorado. That sucker would go from 20 PSI to 150 in less than 5 minutes and it was queiter than my stupid 30 gal Husky.