Re: Fluval 404 external filter
#8
Hi,
I've used Fluval 404's since they first came out, and love them! The Aquastop valve sometimes gets a bit of gravel inside it, which means it doesn't shut off the water flow as it should, which I suspect might be the case with yours. When it's working properly, you should be able to flip up the hinged plastic flange thingy and shut the water off completely (make sure you push the thing all the way up). If this doesn't work, and there's no gravel in it, then there might be a fault with it and I'd take it back to the shop where you bought it.
Marc