Pool and Spa
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Most built in spas today use a specific type of jet insert. We need to figure out which ones you have and then purchase the proper removal tool, once you get the insert out you can use a standard rubber plug to winterize. If you look into the opening in most cases the jet internal will have a lock ring holding it in place and with a good pair of needle nose pliers you can rotate that lock nut and remove the jet internal bu you might need to drain the spa down so you can see inside the jet. here is a picture of one of the type jet inserts I am talking about.
If the spillover spa is fiberglass I would do 1/2 full and blow out normally just like the pool use good plugs to blow out the lines. As for the main drain in the spa you will need to drain out the spa and blow out the drain line and plug it, then in spring drain out again and un-plug drains. You want to have at least 1/2 the spa filled to keep the weight ratio correct so ground pressure does not pop the spa out of the ground. If the spa is vinyl you need it to be close to full.
This tool should do it.
I believe that size rubber plug is an 11 or 12