The Giant Pumps 07258 is a new washer for pumps. Used to replace a worn of damaged one inside your pump. Made with copper. Compatible with MP4120, MP4124, MP4126, MP4135, MP4130, MP4130HK, MP4120-SWS, MP4124-SWS, LP350, LP400, LP450, P420CR-0020, P420, P420-0011, P420-0021, P422, P423, P425, P470, P470-7000, P490, and P490-7000. A genuine OEM Giant Pumps parts. Factory parts ensure a proper fit and material compatibility.