The Medo pumps are Quiet, Extremely reliable, vary long lasting pumps, and I am selling my last spare gently used one, and keeping only the one that powered my fish room for years. This spare and the other one I sold were used only when I was remodeling my fish room, or had extra tanks set up for temporary holding or quarantine. No need for me keeping multiple pumps taking up space on a garage shelf. This pump can deliver 80 liters of air per minute, so it excels at supply air to multiple tanks, or entire fish rooms (or even a goldfish or koi pond). They sell for about $300. new, I will sell and ship this like new pump for $125.