An extrusion device for producing a ceramic tube closed with a base (B), comprising a mouthpiece , a mandrel coaxially arranged therein and a coaxially arranged, temporarily removable closure piece closing the mouthpiece , wherein inner surfaces of the mouthpiece and the closure piece and an outer surface of the mandrel delimit a gap , which between the mandrel and the mouthpiece corresponds to the shape of a tube section (R) and between the mandrel and the closure piece corresponds to the shape of the base (B) of the ceramic tube to be produced, and the gap communicates with a feed chamber filled with a ceramic mass (M), and the closure piece has an air outlet opening via which, when the gap is filled with the ceramic mass (M), the gap can be vented and an excess of the ceramic mass (M) can be pressed out of the gap , and an air inlet opening is provided in the closure piece which can be selectively opened and closed when the mouthpiece is closed, wherein a central bore extending coaxially to the mouthpiece is provided in the closure piece , in which central bore a piston is displaceable over a first piston stroke (h 1 ) between an upper end position (L O ) and an intermediate position (L Z ) and over a second piston stroke (h 2 ) between the intermediate position (L Z ) and a lower end position (L U ), wherein the air outlet opening is formed by a first channel bore , which opens into the central bore between the upper end position (L O ) and the intermediate position (L Z ), and the central bore , characterized in that either the air inlet opening is formed by a second channel bore , which opens into the central bore between the intermediate position (L Z ) and the lower end position (L U ), and by the central bore , or the central bore has a larger diameter below the intermediate layer (L Z ) than above the intermediate layer (L Z ), as a result of which an annular gap is formed around the piston in the lower end position (L U ), which gap, in conjunction with the open central bore , constitutes the air inlet opening , or the central bore is fully exposed when the piston is in the lower end position (L U ), whereby the central bore constitutes the air inlet opening . an air inlet opening is provided in the closure piece which can be selectively opened and closed when the mouthpiece is closed, wherein a central bore extending coaxially to the mouthpiece is provided in the closure piece , in which central bore a piston is displaceable over a first piston stroke (h 1 ) between an upper end position (L O ) and an intermediate position (L Z ) and over a second piston stroke (h 2 ) between the intermediate position (L Z ) and a lower end position (L U ), wherein the air outlet opening is formed by a first channel bore , which opens into the central bore between the upper end position (L O ) and the intermediate position (L Z ), and the central bore , characterized in that either the air inlet opening is formed by a second channel bore , which opens into the central bore between the intermediate position (L Z ) and the lower end position (L U ), and by the central bore , or the central bore has a larger diameter below the intermediate layer (L Z ) than above the intermediate layer (L Z ), as a result of which an annular gap is formed around the piston in the lower end position (L U ), which gap, in conjunction with the open central bore , constitutes the air inlet opening , or the central bore is fully exposed when the piston is in the lower end position (L U ), whereby the central bore constitutes the air inlet opening . <EOS>