Connecting unit for components in a breathing system

An assembly plate for a breathing system, said assembly plate comprising:

• a connecting unit including a plug adapter;
• a sealing element arranged in a groove of said plug adapter and being configured to peripherally seal said plug adapter on a receiving bore of said assembly plate;
• said sealing element being made of elastic, deformable material and having a first peripheral fastening thickening and a second peripheral fastening thickening arranged at a distance from said first fastening thickening;
• said sealing element further including an undercut arranged between the first and second fastening thickenings and configured as a deformation zone;
• said second fastening thickening of said sealing element having an outer lead-in chamfer configured for said receiving bore;
• said undercut being insertable into said receiving bore;
• said undercut having a first section having mutually parallel spaced wall surfaces and a second section having a trapezoidally-shaped cross-sectional contour extending between said parallel spaced wall surfaces;
• said receiving bore having a first end, a second end, and an inner surface that extends from the first end to the second end;
• said receiving bore being positioned between and abutting the parallel spaced wall surfaces and the inner surface extending over the trapezoidally-shaped cross-sectional contour and forming a void between the inner surface and a surface of the trapezoidally-shaped cross-sectional contour;
• said undercut and said inner surface forming said deformation zone;
• and,
• said plug adapter being self-centering in said receiving bore,
• wherein said receiving bore has a material thickness (m3);
• and,
• wherein said first and second fastening thickenings define an inner distance (A1) in said first section which is less than said material thickness (m3).