Higdon Pulsator Bilge Pump & Filter CapThe Higdon Pulsator Bilge Pump & Filter Cap is the replacement for the Bilge Pump and Filter Cap. The Filter Cap mounts to the keel on the decoy with 4 screws and the Bildge Pump attaches to the Filter Cap. NOTE: If your Pulsator was purchased in 2007 it may have a Version 1 plug shown in picture. If you have a Ver 1 plug you will need to purchase a replacement battery box in order for the plugs to match.