Tube element (1, 101, 201) made of expanded polymer, preferably expanded polypropylene, for realizing a tube by coupling at least two of said tube elements (1, 101, 201), wherein said tube, along the length of said tube, has a constant nominal outer diameter and a constant nominal inner diameter, said tube element (1, 101, 201) comprising: a central tube part (3, 103, 203) comprising a central tube part inner wall (5, 105, 205) extending along the length of said central tube part at said nominal inner diameter and a central tube part outer wall (7, 107, 207); a first connection arrangement (9, 109, 209) provided at a first end of said central tube part (3, 103, 203), wherein said first connection arrangement (9, 109, 209) comprises a first connection arrangement inner wall (11, 111, 211) extending along the length of said first connection arrangement (9, 109, 209) at said nominal inner diameter and a first connection arrangement outer wall (13, 113, 213) extending along the length of said first connection arrangement (9, 109, 209) at a first connection arrangement nominal outer wall diameter; a second connection arrangement (15, 115, 215) provided at a second end of said central tube part (3, 103, 203), wherein said second connection arrangement (15, 115, 215) comprises a second connection arrangement inner wall (17, 117, 217) extending along the length of said second connection arrangement (15, 115, 215) at a second connection arrangement nominal inner wall diameter and a second connection arrangement outer wall (19, 119, 219) extending along the length of said second connection arrangement (15, 115, 215) at said nominal outer diameter; wherein said first connection arrangement outer wall diameter is larger than said second connection arrangement inner wall diameter for realizing a frictional coupling of said at least two tube elements (1, 101, 201); wherein a difference between said nominal outer diameter and said nominal inner diameter is in the range of 20 to 40 mm; and wherein one of said first connection arrangement (9, 109, 209) and said second connection arrangement (15, 115, 215) is provided with a protrusion (21, 121, 221) extending in a radial direction from said first connection arrangement outer wall (13, 113, 213) or said second connection arrangement inner wall (17, 117, 217), wherein said protrusion (21, 121, 221) is arranged for cooperation with said first connection arrangement outer wall (13, 113, 213) or said second connection arrangement inner wall (17, 117, 217) of the other of said first connection arrangement (9, 109, 209) and said second connection arrangement (15, 115, 215) for realizing a further frictional coupling of said at least two tube elements (1, 101, 201). a central tube part (3, 103, 203) comprising a central tube part inner wall (5, 105, 205) extending along the length of said central tube part at said nominal inner diameter and a central tube part outer wall (7, 107, 207); a first connection arrangement (9, 109, 209) provided at a first end of said central tube part (3, 103, 203), wherein said first connection arrangement (9, 109, 209) comprises a first connection arrangement inner wall (11, 111, 211) extending along the length of said first connection arrangement (9, 109, 209) at said nominal inner diameter and a first connection arrangement outer wall (13, 113, 213) extending along the length of said first connection arrangement (9, 109, 209) at a first connection arrangement nominal outer wall diameter; a second connection arrangement (15, 115, 215) provided at a second end of said central tube part (3, 103, 203), wherein said second connection arrangement (15, 115, 215) comprises a second connection arrangement inner wall (17, 117, 217) extending along the length of said second connection arrangement (15, 115, 215) at a second connection arrangement nominal inner wall diameter and a second connection arrangement outer wall (19, 119, 219) extending along the length of said second connection arrangement (15, 115, 215) at said nominal outer diameter; wherein said first connection arrangement outer wall diameter is larger than said second connection arrangement inner wall diameter for realizing a frictional coupling of said at least two tube elements (1, 101, 201); wherein a difference between said nominal outer diameter and said nominal inner diameter is in the range of 20 to 40 mm; and wherein one of said first connection arrangement (9, 109, 209) and said second connection arrangement (15, 115, 215) is provided with a protrusion (21, 121, 221) extending in a radial direction from said first connection arrangement outer wall (13, 113, 213) or said second connection arrangement inner wall (17, 117, 217), wherein said protrusion (21, 121, 221) is arranged for cooperation with said first connection arrangement outer wall (13, 113, 213) or said second connection arrangement inner wall (17, 117, 217) of the other of said first connection arrangement (9, 109, 209) and said second connection arrangement (15, 115, 215) for realizing a further frictional coupling of said at least two tube elements (1, 101, 201).