UPGRADE YOUR VACUUM CLEANER: Replace the sponge pad with the motor cover and HEPA filter to reduce noise and improve your vacuum cleaner's filtration and performance. Compatibility: Compatible with Dyson V7 V8 cordless vacuum cleaners. The rear engine cover is used to connect the engine and filter. Installation steps: open the back of the vacuum cleaner with a thin hard sheet, take out the sponge pads, put the back cover part back on and press it firmly into the vacuum cleaner, then install the filter. (The logo part must face up when installing). High quality: delicate and exquisite, perfectly matched with the equipment. The back cover does not need to be removed after installation if not required.