HQRP 2-Pack Foam Pre-Filter RF360PRE Petsafe/Drinkwell 360 Plastic Pet Fountains Water Bowl D360-RE Coaster HQRP 2-Pack Foam Pre-Filter Replacement + HQRP Coaster; Compatible with Drinkwell RF360PRE Filter Replacement; Drinkwell 360 Plastic D360-RE; Plastic version not the Stainless Steel! Dimensions: diameter 4.9" / 125mm, thickness 1.8" / 45mm; The Foam Filter collects hair, debris and pet food before they reach the pump; 2 weeks DOA replacement warranty!