LTWHOME Replacement Foam Pre-Filters Fit for Drinkwell 360 Plastic Pet Fountain,Not Suitable for Stainless Steel Fountain Pack include: 12pcs(Note: only fit the plastic fountain not suitable for stainless steel fountain) Prolongs the life and flow rate of the filter pump . Provides your pet with cleaner, healthier water . Traps any large particles and debris in the water before they reach the pump,enhancing overall filtration . Compatible with Drinkwell 360 plastic version not the stainless Steel .