The Volvo Penta O-Ring (925256) is designed for sealing applications on Volvo Penta saildrives and marine gearboxes . ⚠ Important note: When used on a saildrive , two O-rings are required . Please order 2 pieces for a complete installation. Product Type O-ring / sealing ring Volvo Penta OEM / Reference Number 925256 Compatibility Suitable for Volvo Penta saildrives and gearboxes: Saildrives 120SC 130S 130S-B 130S-C 130S-D 130SR 130SR-A 130SR-B 130SR-C 130SR-D 150S 150S-B 150S-C 150S-D 150SR 150SR-B 150SR-D Sterndrives DP-A DP-A2 DP-C DP-D SP-A2 SP-C SP-C1 Gearboxes MS2B MS2V MS3B MS3C MS4A MS4B