A replacement for the inflatable liner supplied with your Lay?Z?Spa® Hollywood model. The liner is the hub of your Lay?Z?Spa®. It's the area of your Lay?Z?Spa® that is filled with water and connects to the heater pump. It also contains integrated massage jets that provide a relaxing spa experience. IMPORTANT: The screw valve is not included, this will need to be purchased separately unless you save this from your previous liner (2021 model) the screw valve required is shown in the image gallery PLEASE NOTE: Th replacment lining may appear to be smaller than your previous one. This is because the new lining, once inflated and filled, will expand over about 4 to 6 weeks due to the hot water.