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 1/2in Flex-Series Random Flow Generator Nozzles – RFG050-FLX New Flex-Series Adapters 25mm to 3/4in Pipe Adapter & the new 2530-075 Multidapter Genuine Loc-line 3/4in to 1/2in Y Fitting and 4 Sections of genuine 1/2in Loc-Line RFG-FLXExtremely Durable and Flexible Material Manufactured with a reef-safe TPU (Thermoplastic Polyurethane) Ultimate Compatibility The Ultimate 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 smaller) Genuine 3/4in Loc-Line fittings (this includes most custom built aquariums) Red Sea MAX (Return line) CADE Reef Series Aquarium 25mm Metric Pipe 3/4in slip or threaded bulkheads 3/4in Schl40 PVC pipe elbows and socket fittings 1in Schl40 PVC pipe Any bulkheads or pipe socket with 25mm to 30mm inner diameter MarineCost and more