Red Sea Reefer Compatible Plus, many other aquariums using the included Multidapter Universal Pipe Adapter Kit Includes: The Patented Random Flow Generator Nozzles 2 x 3/4in Flex-Series Random Flow Generator Nozzles – RFG075-FLX New Flex-Series Adapters 25mm to 3/4in Pipe Adapter & the new 3035-075 Multidapter Genuine Loc-line 3/4in Y Fitting and 4 Sections of genuine 3/4in Loc-Line Includes the New Flex Series Random Flow Generator RFG-FLXExtremely Durable and Flexible Material Manufactured with a reef-safe TPU (Thermoplastic Polyurethane) Ultimate Compatibility The Ultimate XL Return Line Upgrade Kit is directly compatible with wide variety of aquarium brands and models, including the aquariums listed below Red Sea Reefer (All models - Recommended for the 525 and Larger) Genuine 3/4in Loc-Line fittings (this includes most custom built aquariums) Red Sea MAX (Return line) CADE Reef Series Aquarium 25mm Metric Pipe 1in slip or threaded bulkheads 1in Schl40 PVC pipe elbows and socket fittings 1.25in Schl40 PVC pipe and 25mm Metric pipe Any bulkhead or pipe socket with 30mm to 35mm inner diameter