The new EV Series skimmers are designed to run in sumps WITHOUT BEING RAISED. The output gate valve has been increased to a height of 6.25" (7.25" for the EV180), which means that as long as your sump level is 6.25" or lower you will not need to worry about fluctuations having an impact on skimming consistency. The powerful EV-240 can sit in water as deep as 10". These skimmers can also be plumbed for external applications.