i had a mag float imitation on a smaller tank (10 gallon) for a while and i hated it. the portion that is in the tank didn't float, so whenever the connection was broken between inside and outside piece i had to get my arm all wet retrieving the inside piece. not sure if this was a walmart brand one (i had gotten it used with a tank purchase) but it was white with a curved blue handle area.
spend the extra few bucks and get a real mag float.