Cartridge Aerator Pump1000 GPH - StraightJohnson Pump cartridge aerator pumps offer the ease of convenience and years of reliable service. Improved design with easy-to-install Dura-Port discharge port. Smaller profiles to fit in more confined spaces. Easy to change motor cartridge.Features:Capacities 500, 750, 1000 and 1250 GPHAvailable in two different intake configurations: straight or 90AdegCompact, easily replaceable all-in-one motor/impeller unitNo tools needed for maintenanceExtremely energy efficientWater-cooled motor for long service intervalsImproved design with easy-to-install Dura-Port discharge ports (straight and a 90Adeg smooth elbow included) eliminate stress cracking caused by over-tightened hose clampsMeets the international standard, ISO 8849 marine