This inflatable cover, or bladder, fits the Mono 8 or Tuscany spas. It is made of white PVC and goes between the water and the cover of your spa. It provides a sealed pocket of air for insulation. 

Inflate the cover and put it on the water (under the cover), and it will help your water retain heat by adding an extra layer of insulation in the spa. It also decreases sagging so the rainwater can run off. If you find the rain water still pools on your cover you can try two things; just before you take the cover off your pool, try tightening the buckles. You can also velcro an appropriately sized ball or swim ring to the underside, centre of your cover to provide a greater pitch so the water runs off. 

Please note that the warning on the bladder should read, stop inflating before the wrinkles disappear. The hot water of the spa pool together with sunlight will cause the air in the bladder to expand. When you take the bladder off the spa pool, if your hand doesn't easily push into the bladder, it is over-inflated. Let some air out. If you leave your bladder over inflated, in due course its shape will either change to the "flying saucer" effect or it will start to leak air. 

Inflated, size of bladder is: 178cm

Also, under product number B0303686

Please note: Does not include the spa, Inflatable Insulation Bladder is the inner white part B9300403 B0303973