Combustion equipment, the combustion equipment having: an inner case and an outer case, wherein the outer case encloses the inner case so that a cavity is located between the inner and outer cases (30, 32); a fuel delivery device for use in delivering fuel into a combustion region within the inner case, wherein the fuel delivery device passes through a hole in the outer case and a corresponding hole in the inner case; and a seal assembly configured to seal the hole in the outer case through which the fuel delivery device passes so as to inhibit pressurised gas in the cavity located between the inner and outer cases (30, 32) from leaking out from the hole in the outer case when the combustion equipment is in use; the seal assembly includes a primary seal, the primary seal includes a sealing member, the sealing member comprises a flexible sleeve that extends around the fuel delivery device, the flexible sleeve is attached to outer case, characterised in that the flexible sleeve interconnects the inner case with the outer case (30, 32), the flexible sleeve is attached to the inner case, the flexible sleeve being configured to flex so as to permit relative movement of the inner and outer cases (30, 32) when the combustion equipment is in use, the flexible tube is a bellows that includes a plurality of folds, the seal assembly includes a secondary seal that is located between the flexible sleeve and the cavity located between the inner and outer cases (30, 32) such that an additional cavity is formed between the secondary seal and the flexible sleeve, a liner is provided in the hole in the outer case, the liner is arranged around the flexible sleeve, the additional cavity is formed by the liner, the flexible sleeve and the secondary seal. an inner case and an outer case, wherein the outer case encloses the inner case so that a cavity is located between the inner and outer cases (30, 32); a fuel delivery device for use in delivering fuel into a combustion region within the inner case, wherein the fuel delivery device passes through a hole in the outer case and a corresponding hole in the inner case; and a seal assembly configured to seal the hole in the outer case through which the fuel delivery device passes so as to inhibit pressurised gas in the cavity located between the inner and outer cases (30, 32) from leaking out from the hole in the outer case when the combustion equipment is in use; the seal assembly includes a primary seal, the primary seal includes a sealing member, the sealing member comprises a flexible sleeve that extends around the fuel delivery device, the flexible sleeve is attached to outer case, characterised in that the flexible sleeve interconnects the inner case with the outer case (30, 32), the flexible sleeve is attached to the inner case, the flexible sleeve being configured to flex so as to permit relative movement of the inner and outer cases (30, 32) when the combustion equipment is in use, the flexible tube is a bellows that includes a plurality of folds, the seal assembly includes a secondary seal that is located between the flexible sleeve and the cavity located between the inner and outer cases (30, 32) such that an additional cavity is formed between the secondary seal and the flexible sleeve, a liner is provided in the hole in the outer case, the liner is arranged around the flexible sleeve, the additional cavity is formed by the liner, the flexible sleeve and the secondary seal.