Exhaust gas treatment apparatus for an exhaust gas system of a motor vehicle, comprising - a housing, having o a housing casing, a first end plate and a second end plate, o which form an inner chamber, - an intake pipe, arranged entirely or partially in the inner chamber, which defines a longitudinal axis, - an oxidation catalytic converter, arranged entirely or partially in the intake pipe, having an oxidation catalytic converter casing, wherein the oxidation catalytic converter casing joins the intake pipe in at least one first joining region, - a particulate filter, arranged partially in the intake pipe, having a particulate filter casing which penetrates the second end plate, - a connection pipe, which is detachably attachable or attached to the particulate filter casing by means of a connecting device, wherein - the intake pipe, the second end plate and the connection pipe are connected to each other in a connection section, wherein - the intake pipe, the second end plate and the connection pipe are arranged overlapping along the longitudinal axis in the connection section, and - are connected to each other in the connection section by means of a common welding seam, or - the intake pipe and the connection pipe are arranged at a distance to each other along the longitudinal axis in the connection section, wherein o the intake pipe is connected to the second end plate in the connection section by a first welding seam, and o the connection pipe is connected to the second end plate in the connection section by a second welding seam. - a housing, having o a housing casing, a first end plate and a second end plate, o which form an inner chamber, o a housing casing, a first end plate and a second end plate, o which form an inner chamber, - an intake pipe, arranged entirely or partially in the inner chamber, which defines a longitudinal axis, - an oxidation catalytic converter, arranged entirely or partially in the intake pipe, having an oxidation catalytic converter casing, wherein the oxidation catalytic converter casing joins the intake pipe in at least one first joining region, - a particulate filter, arranged partially in the intake pipe, having a particulate filter casing which penetrates the second end plate, - a connection pipe, which is detachably attachable or attached to the particulate filter casing by means of a connecting device, wherein - the intake pipe, the second end plate and the connection pipe are connected to each other in a connection section, wherein - the intake pipe, the second end plate and the connection pipe are arranged overlapping along the longitudinal axis in the connection section, and - are connected to each other in the connection section by means of a common welding seam, or - the intake pipe and the connection pipe are arranged at a distance to each other along the longitudinal axis in the connection section, wherein o the intake pipe is connected to the second end plate in the connection section by a first welding seam, and o the connection pipe is connected to the second end plate in the connection section by a second welding seam. o the intake pipe is connected to the second end plate in the connection section by a first welding seam, and o the connection pipe is connected to the second end plate in the connection section by a second welding seam.