Gas cooking appliance

Gas cooking appliance comprising at least one gas burner equipped with a gas injector which is screwed onto a gas supply tube, the said injector and/or the said tube being engaged through an aperture in a top plate to which the said injector is fixed, the injector and the tube are situated essentially one on each side of the support plate, wherein a radially extending annular flange is provided on the supply tube, which flange is situated under the support plate, and clamped in a sealed fashion against the peripheral edge of the aperture and/or bearing surface of the injector so that, when the injector and the supply tube are being assembled, one on each side of the support plate, a seal is produced between the tube and the injector, on the one hand, and between the top and the underside of the support plate around the edge of the aperture, on the other hand, and at the same time to mechanically hold the injector secured to the supply tube in a centred position in the aperture with the outlet orifice of the injector situated in a predetermined axial position above the support plate.