After a one year hiatus, the AP Series is back by popular demand. Check out the latest from the Precision Marine R&D department. If you believe in fundamental foam-fractionation principles, and don’t mind changing wooden air diffusors, then this is the model for you. Two Models Available AP-424 / AP-624 Specifications: - Overall Height: 24” / 24” - Reaction Tube Diameter: 4” / 6” - Base Diameter: 5.75” / 7.75” - Water Inlet Size: 1/2” Union / 1/2” Union - Water Outlet Size: 1” FPT / 1” FPT - Waste Collector compatible: Yes / Yes - Suggested Water Flow: 1-2x tank volume / 1-2x tank volume - Recommended Capacity: 100gal. / 250 gal.