A Trusted Design The RFG Flex Series maintains the patented design of the Random Flow Generator® Nozzle. The design continues to be trusted by aquarium hobbyists and aquatic industry users alike. The RFG Flex Series will build on this trust earned over the years by delivering a new level of durability, flexibility and an enhanced functionality. RFG Flex Series Enhancements • Broader range of direct compatibility • Enhanced Randomized Flow • Higher throughput (5% to 10% more) • Easier to clean & maintain • Extremely durable