Patent ID: 8251353

Claim:
A fastening device for fastening a membrane being perforated for aeration to an aerator base plate, with an aerator base plate that has an undercut groove in at least one rim region, and with at least one locking body having a generally circular cross-section, which locking body clampingly fits into said groove thereby tightly clamping the membrane, characterized in that the groove is open towards the upper side of the aerator base plate, has an at least substantially oval cross-section, and extends with its longer cross-sectional axis towards the upper side, and the groove externally, on the outer rim of the aerator base plate is delimited by a web wall which projects upwards further beyond an upper edge of an opening of the groove when in the operating position, the wall of the groove and/or the locking body being elastically deformable when pressing the locking body and the membrane in to the groove.