the purpose of the screw 10 is furthermore to raise the casting gutter somewhat at that end which has the pouring lip 2 whereby the flow of the melt in the gutter 4 is ensured the pouring lip is demountably attached to the furnace 1 for example by means of a bolt joint 22 the casting gutter 4 has two separate covers 11 and 12 which are both demountable they are also both sealed to the body of the gutter 4 by means of sealing grooves 13 and 14 holding seals 24 which are resistant to high temperatures furthermore all the seals of the combination are if so desired placed in seal sleeves in order to pack the flexible sealing material the cover 11 is provided with an opening 15 in which a burner is installed when so desired to preheat the casting gutter in order that the metal being cast remain sufficiently molten all the time and not adhere to the gutter the cover 12 is provided with openings 23 the intention being to install in them systems for blowing shield gas into the casting gutter 4 if a burner and devices for blowing shield gas are not connected to openings 15 and 23 the openings are closed tightly with separate covers especially in fig4 it can be seen that the casting gutter 4 is lined.