An easy solution for heavy and periodical water change needed by large fish tank *Directly siphons water from aquarium to sink and then adds tap water to aquarium straightly afterwards *Eliminating the hassle of a transfer bucket. Greatly simplify operation for water change for large fish tank *Specially-designed vacuum with strainer help protect fish and plant when removing waste and doing water change *A manual valve right after the vacuum for easy control of water flowing out and into the aquarium in the course of water change. Model: WC75/ WC150 Length of Hose WC75 : 7.6m/25ft Length of Hose WC150 : 15.2m/50ft Size of Hose: (o) 15*12mm