pump too loud

I don't have the exact model number on me right now, but it's one that looks very similar if not is this pump;

http://www.google.com/m/products/ca...=X&ei=ygFzT7SDI4Lz0gG31K2-AQ&ved=0CHcQ8wIwAg#

is there a way I can muffle the sound from it? It's very loud.

 

really? There's no solution at all? is there a way to adjust it?