I bought this hot tub on craigslist from a guy that said the person he bought it from said it works great but some pvc piping is busted due to being left filled up in the winter, bought it really cheap for 140 bucks. The tub itself is in great shape. Some of the outside wood work could use replaced but that isn't my main issue. I am having trouble finding a manual for this thing and am trying to figure out how the plumbing is supposed to go. Would any one happen to know where I can get a manual for this thing? I can put up pictures of the plumbing and pershaps someone with more knowledge with hot tubs than me and help me figure out exactly how this is supposed to go. I have been reading countless forums and researching this project every chance I get. I know it needs to pull from the cartridge to the pump and then back to the pool. I have a heater safety pvc pipe that looks like it goes in the middle and I think the end portion is for the drain valve. However I have an s shaped pvc piping that I can't figure out so far. I will take pictures later and put them up. Would really love someone's help on this. I believe this hot tub is a Sonoma model 78TO. The control panel is sonoma ss12b, century lessor spa motor, hayward cartridge cleaner model c250. It was manufactured in 1987 and the motor etc.. are all external.