Size:M(58 inch) Safe and durable, not easily oxidized. Inner tube surface is smooth, ensuring water circulation well. It can be used with other accessories to set different flow schemes. Modular pipe components offers flexibility and control directing water flow in your refugium, sump and reef aquarium. It is a essential tools for home fish tank, aquarium.Fit to any pipehose with 516 inch OD, wide use at Aquarium, fish tank and pump. Use with circulating pump or return pipe. Package Content : 2 x Aquarium Nozzle.