Rule 1500 automatic submersible bilge pump - 12V RULE 1500 GPH automatic submersible bilge pump. IMPROVED FLOW RULE 1500 GPH automatic submersible bilge pump - 12V instead of 13.6V for a 10% increase in flow rate.Thermal protection with automatic pump shutdown in the event of overheating.Anti-backflow valve and air vent ensure proper water circulation.Removable base for easy cleaning.RULE 1500 GPH automatic submersible bilge pump comes complete with fittings. -