Volvo Penta SX-A/DPS Magnesium Anode Kit | Martyr CMSXAKITM Martyr anode kit includes replacement anodes to protect Volvo Penta SX-A and DPS model stern drives from corrosion in fresh water. Volvo Penta stern drive anode kit For Volvo Penta SX-A and DPS model drives Kit includes CM3841427M transom block anode and 3883728M gearcase anode Magnesium anodes for use in fresh water applications Martyr anodes are made of a high purity specialized alloy based on the US Mil Spec Supplied with mounting hardware for anodes