Abstract: This concerns a device whose filtering membrane (4) is gripped annularly at the periphery between an annular transverse wall (32) forming part of a drainage body and an axially oriented cylindrical wall (9) of an intake body, which lateral wall has an elastomer seal (13) which forms the edge thereof and by means of which this wall comes into contact with the membrane (4), this device being provided with a second seal (55) which has an arched profile, the external annular end (61) of which bears against said annular transverse wall (32) radially beyond said membrane (4), and the internal end (57) of which is connected to said seal (13) on the lateral wall (9) of said reservoir (5), hereinafter referred to as the first seal.

Abstract: The method includes the step of positioning the device on a sheath (94) having, for each latching tab (7), a portion adapted to be housed between this tab and a cylindrical wall of the device; the step of making the sheath enter between each tab and the cylindrical wall until means preventing the withdrawal of the tabs are released; and the step of moving the two bodies (2,3) away from each other. The instrument has, in addition to the sheath (94), a guidance slide (77).

Abstract: The method includes the step of positioning the device on a sheath (94) having, for each latching tab (7), a portion adapted to be housed between this tab and a cylindrical wall of the device; the step of making the sheath enter between each tab and the cylindrical wall until means preventing the withdrawal of the tabs are released; and the step of moving the two bodies (2,3) away from each other. The instrument has, in addition to the sheath (94), a guidance slide (77).

Abstract: This concerns a device whose filtering membrane (4) is gripped annularly at the periphery between an annular transverse wall (32) forming part of a drainage body and an axially oriented cylindrical wall (9) of an intake body, which lateral wall has an elastomer seal (13) which forms the edge thereof and by means of which this wall comes into contact with the membrane (4), this device being provided with a second seal (55) which has an arched profile, the external annular end (61) of which bears against said annular transverse wall (32) radially beyond said membrane (4), and the internal end (57) of which is connected to said seal (13) on the lateral wall (9) of said reservoir (5), hereinafter referred to as the first seal.