The RedFlex™ Reef Sump is designed specifically for saltwater systems. This sump features a modern red and white acrylic design. Water flows through the overflow ports, into our proprietary bubble diffusers making this sump very quiet. and through the 4 inch 200 micron filter socks. Each sump includes an overflow panel where the water can escape into the sump if your socks overflow. The Red Flex is equipped with a dosing, probe, and wire holders, easily maintained by the built in fastener. Water levels exiting the refugium chamber can be adjusted between 6 to 9 inches via the adjustable flow gate, depending on your specific needs. It also Includes flexible hoses, 4 inch Micron bags and the foam block sponge. Ultra Quiet Modern Design Made in the USA Lots of extras All Pro Clear Sumps are made in the USA and include lifetime warranty against leaks and defects due to workmanship. RedFlex Reef Sump Compartment Dimensions Model Overall (") Skimmer (") Media (") Return (") Reef 100 24x10x16 7-3/16 x 6-3/4 8 x 3-15/16 8 x 3-13/16 Reef 200 32x12x16 9-3/16 x 8-1/4 10 x 6-5/16 10 x 7 Reef 300 37x14.5x16 11-11/16 x 11-7/16 12-1/2 x 7 12-1/2 x 7-5/16 Reef 400 45x14.5x16 11-11/16 x 14-7/16 12-1/2 x 8-7/16 12-1/2 x 10-5/16 RedFlex Reef Sump Stats Model Micron Bags Tank Size Inlets Flow Rate Reef 100 (2) 4-inch 10 - 100 g 1 400 gph Reef 200 (2) 4-inch 100 - 225 g 2 800 gph Reef 300 (3) 4-inch 225 - 300 g 2 1200 gph Reef 400 (3) 4-inch 300 - 400 g 2 1600 gph