SeaSense Hand Bilge Pump Hose Anti-Leak Design Removable Hose For Easy Storage Self-Priming Reach Small, Compact Areas With Ease Light Weight Corrosion Resistant Large ergonomic, easy grip, high impact handle. Tube cap. Caps the tube and forces the water out of the outlet and also supports the plunger shaft. Plunger spacer keeps the shaft from coming up too far and damaging the plunger washer. Plunger washer forces water up and thru the outlet.