TheMiller07

So we decided that it would be a good idea to buy a used hot tub off a guy on craigslist and instal it ourselves. I have a friend who is an electrician and did that work for us, bought new blower, pump, heater and have no idea how to install that but am trying (any advice would be greatly appreciated) We have it all cleaned and lookin pretty good except there is one random plastic thing that I can't quite figure out what it is/does and how I can replace it. Can someone please tell me what this does, what it is called and where I can find a new one b/c obviously this one looks like the devil!