method for manufacturing a degasser of the present invention in particular for bonding the membrane to the body 1 is the subject of a co pending european patent application entitled u201c a method of joining two or more parts u201d filed on the same date and by the same applicant as the present application reference is now made to fig4 on the side of the membrane 4 a opposite to the body 1 a piece of a gas permeable layer 12 and a glass frit 9 acting as a supporting structure are arranged and then mounted using a cover 10 the frit 9 and the layer 12 everywhere project beyond the edge 7 a of the depression 7 so that there is no danger that the membrane 4 a is damaged at the edge 7 a by the frit 9 without such a measure the thin membrane typically 5 micrometers thick can easily be damaged because the body 1 which is typically made of ptfe can easily deform locally and the frit 9 may be pushed through the membrane 4 a according to a practical example the gas permeable layer 12 has a thickness of about 100 micrometers and a diameter of 40 mm and the glass frit 9 has a pore width of less than 25 micrometers a diameter of 40 mm and a thickness of 4 mm the layer 12 may be for example stretched ptfe filter material with a thickness of about 100 micrometers the cover.