Dimensions: screw adapter diameter 108 mm, outer diameter 69 mm, height 54.5 mm, inner diameter BASIC ACCESSORIES: Screw bottom + filter element for MSpa Pre 2020-2021 Hot Tub Fitting FD2089, combined with an additional support Pleated design: automatically filters impurities from the water This filter is one of the most efficient filtration systems for inflatable spas, with 90 flakes and a surface area of 4000 square centimeters Economical: The filter element is installed in the filter pump and captures dust as it passes through the system Prevents dust from entering the pump and heater, thus extending their life Easy to clean: simply remove the filter from the pump and rinse off the dirt with a garden hose It is recommended to replace the filter element every two weeks in summer and autumn to keep the water clean