ASM in-sump skimmers are constructed of extruded PVC tubing and injection molded plastic. ASM protein Skimmers use needle wheel design on a Sedra pump for to create a finer bubble for highly effective skimming action! Easy to use! Just set it in the sump, plug it in and adjust the outlet tube! ASM G 4+ Protein Skimmer Specifications: - Gallon Rating: up to 400 gal. - Pumps: 1 x Sedra KSP9000 Needle Wheel Pump - Reaction Chamber Diameter: 8.5" - Collection Cup: 6.5" H x 9" dia. - Height: 24"