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 (L), - 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 (L) 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 (L) 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 (L), - 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 (L) 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 (L) 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 . <EOS>