9991467-R4 Ultra-Fine Filter Panels Set For Dolphin Active 20 Explorer E30 M600 Proteus 1. 9991467-R4 Ultrafine Filter for Dolphin Pool Cleaners: Active 20, Active 30, Active 30i, Active 40, Active 60, Advantage Ultra, Discovery (new), Explorer E30, Explorer E50, Explorer E70, M600, Mercury, Premium, Proteus DX4, Proteus DXSi, Prowler 920, Prowler 930, Prowler 930W, Quantum, S200, S300, S300i, S400, T35, T45, T55i, Triton PS, Triton PS Plus, Warrior SE, Warrior SI 2. Strong and durable, not easy to deform or break. 3. The filter of the pool cleaner can be easily popped off and can be rinsed directly from the filter with a garden hose, quickly clean the dirt in the filter, and the filter is reusable! 4. Easy to install, each panel is numbered; it is recommended that you remove the filter in the order of 1-4, and then install it in the order of 4-1 for easy replacement. 5. Material: Plastic