Between the canal at the end of the working end and the tin bath there is a spout. Its function  is a  controlled pouring of the glass coming from the working end through the canal on the surface of the liquid tin in the tin bath. As the spout is exposed to really high temperatures, it is manufactured from the high performance  refractory  materials. It helps to prevent its rapid wear.
Before putting it into operation the spout is heated up and only then in the hot state it is installed between the canal and the tin bath. During the glass production the spout is slightly cooled down.