Compatible Models: This replacement o-ring fits the cap/hood/head seal portion is compatible with the SunSun HW303A (HW-303A) and HW303B (HW-303B) cartridge filters. It helps that the filter maintains a good seal of use
Enhanced sealing: O-rings can help preventing water leakage, avoid filter sealing failure that may cause unstable water flow or affect water quality, and keep the water quality in the aquarium clean and stable
Materials: Made of quality rubber, it has water resistance and corrosion resistance
Packaging Specifications: Each pack contains 2 seals to meet replacement needs and have spares for future use
Easy Replacement: This replacement seal is designed for easy installation and removal. It can easily replace it and quickly restore the filter to normal operation
