Neptune COR-15 DC Return Pump (COR-15)COR 15 CONNECTS TO ANY APEX WITH A 1LINK PORT AVAILABLE UP TO 1500 GPH (5700 LPH) FOR INTERNAL OR EXTERNAL APPLICATIONS IQ LEVEL SETS THE PROPER MIN AND MAX FOR YOUR AQUARIUM INCLUDES OVERSIZED 1. 25 in. UNION ENERGY EFFICIENT USES LESS THAN 50W OF POWER! INCREDIBLY QUIET! NO POWER BRICK MEANS CLEANER INSTALL COMPATIBLE WITH ALL APEX SYSTEMS INTELLIGENT, QUIET, ENERGY EFFICIENT Your return pump is by far the most important piece of equipment on your