A mounting sleeve for mounting in a recess in a wall having a first sleeve with a longitudinal axis, wherein a flange is arranged in the region of a first free end of the first sleeve, the flange projects radially outwards beyond the circumference of the sleeve-shaped body as a result that can abut against an outside of the wall, wherein the mounting sleeve has a second sleeve that is arranged displaceably along the longitudinal axis in the first sleeve and the mounting sleeve has a tensioning element which the two sleeves can be brought from a non-tensioned position into a tensioned position, wherein the first sleeve and/or the second sleeve has at least one clamping element which, in the tensioned position, projects radially outwards beyond the circumference of the body of the first sleeve, as a result of tensioning of the mounting sleeve with the wall can be achieved.