General description This premium inflatable heat-retaining lid is designed for the Sealey DL29 Dellonda 2-4 Person Hot Tub/Spa. It ensures minimal maintenance by preventing debris from entering the water and reducing the number of filters needed for cleaning. The lid floats on top of the water, helping to maintain the heat when the tub is not in use. Technical specifications Diameter: 135 cm Height: 18 cm Compatibility and accessories Fits 2-4 Person Dellonda Hot Tub/Spas DL16 and DL23 Installation Place the inflatable bladder onto the spa pool underneath the cover. Usage Helps maintain water temperature when the hot tub is not in use.