A suction muffler for an encapsulated refrigerant compressor, comprising - a suction muffler housing defining a suction muffler volume, wherein the suction muffler housing is made of plastic material, wherein the suction muffler housing has a lower housing part and an upper housing part; wherein the upper housing part includes - an inlet section to allow refrigerant to enter the suction muffler volume, the inlet section comprising an inlet opening and an inlet tube for directing refrigerant to a first suction muffler chamber, the inlet opening being connected to the inlet tube and - an outlet section to allow refrigerant to escape from the suction muffler volume of the suction muffler towards the cylinder of the refrigerant compressor; wherein the lower housing part includes an oil drain opening; the suction muffler further comprises an inner housing element, which is inserted into the suction muffler housing, which inner housing element separates the suction muffler volume into the first suction muffler chamber and a second suction muffler chamber, characterized in that the inner housing element comprises a top wall and a side wall, wherein the first suction muffler chamber is bounded by the lower housing part, the top wall of the inner housing element and the side wall of the inner housing element, and wherein the top wall has a protruding tubular section, wherein at least a section of the inlet tube is received by the protruding tubular section of the inner housing element. - a suction muffler housing defining a suction muffler volume, wherein the suction muffler housing is made of plastic material, wherein the suction muffler housing has a lower housing part and an upper housing part; wherein the upper housing part includes - an inlet section to allow refrigerant to enter the suction muffler volume, the inlet section comprising an inlet opening and an inlet tube for directing refrigerant to a first suction muffler chamber, the inlet opening being connected to the inlet tube and - an outlet section to allow refrigerant to escape from the suction muffler volume of the suction muffler towards the cylinder of the refrigerant compressor; - an inlet section to allow refrigerant to enter the suction muffler volume, the inlet section comprising an inlet opening and an inlet tube for directing refrigerant to a first suction muffler chamber, the inlet opening being connected to the inlet tube and - an outlet section to allow refrigerant to escape from the suction muffler volume of the suction muffler towards the cylinder of the refrigerant compressor; wherein the lower housing part includes an oil drain opening; the suction muffler further comprises an inner housing element, which is inserted into the suction muffler housing, which inner housing element separates the suction muffler volume into the first suction muffler chamber and a second suction muffler chamber, characterized in that the inner housing element comprises a top wall and a side wall, wherein the first suction muffler chamber is bounded by the lower housing part, the top wall of the inner housing element and the side wall of the inner housing element, and wherein the top wall has a protruding tubular section, wherein at least a section of the inlet tube is received by the protruding tubular section of the inner housing element.