The Giant Pumps 08380 replaces an O-ring inside pumps. Compatible with pump models CP460, P420, P420-0011, P420-0021, P420A-5100, P422, P422-5100, P423, P423-5100, P425, P425-5100, P430, P440, P450, P455, P465, P470, P470-7000, P485, P490, and P490-7000. An official OEM part. Ensures a proper fit and material compatibility.