In the UK it is common for some types of fermentors to have a spigot. To lessen the chance of the spigot, in your bucket, being covered with trub, tilt the bucket so the trub and yeast settle to the side away from the spigot. A little sediment may still settle in the mouth of the spigot, but not fill it solid.
Don't take SG samples from the spigot. Taking samples from the spigot will leave residue inside the spigot which can grow colonies of bacteria which will end up in your bottles or keg.