An injector comprising: a fuel distributor with a first fluid inlet and a first fluid outlet, with a first fluid circuit for fluid communication between the first fluid inlet and the first fluid outlet, wherein the fuel distributor includes a second fluid inlet and a second fluid outlet, with a second fluid circuit for fluid communication between the second fluid inlet and outlet; characterized in that the fuel distributor defines a spray axis, wherein the first and second fluid outlets (105, 109) are radially adjacent and are substantially aligned axially relative to the spray axis; wherein the fuel distributor includes: an outer distributor ring; an intermediate distributor ring mounted within the outer distributor ring, wherein the first fluid circuit is defined between the intermediate and outer distributor rings; and an inner distributor ring mounted within the intermediate distributor ring, wherein the second fluid circuit is defined between the intermediate and inner distributor rings; wherein the outer distributor ring includes an internal conical surface with a helically threaded fluid passage defined therein, and wherein the first fluid circuit is defined between a helically threaded fluid passage of the internal conical surface of the outer distributor ring and an outer conical surface of the intermediate distributor ring; and wherein the inner distributor ring includes an outer surface with a helically threaded fluid passage defined therein, and wherein the second fluid circuit is defined between a helically threaded fluid passage of the outer surface of the inner distributor ring and the intermediate distributor ring. a fuel distributor with a first fluid inlet and a first fluid outlet, with a first fluid circuit for fluid communication between the first fluid inlet and the first fluid outlet, wherein the fuel distributor includes a second fluid inlet and a second fluid outlet, with a second fluid circuit for fluid communication between the second fluid inlet and outlet; characterized in that the fuel distributor defines a spray axis, wherein the first and second fluid outlets (105, 109) are radially adjacent and are substantially aligned axially relative to the spray axis; wherein the fuel distributor includes: an outer distributor ring; an intermediate distributor ring mounted within the outer distributor ring, wherein the first fluid circuit is defined between the intermediate and outer distributor rings; and an inner distributor ring mounted within the intermediate distributor ring, wherein the second fluid circuit is defined between the intermediate and inner distributor rings; wherein the outer distributor ring includes an internal conical surface with a helically threaded fluid passage defined therein, and wherein the first fluid circuit is defined between a helically threaded fluid passage of the internal conical surface of the outer distributor ring and an outer conical surface of the intermediate distributor ring; and wherein the inner distributor ring includes an outer surface with a helically threaded fluid passage defined therein, and wherein the second fluid circuit is defined between a helically threaded fluid passage of the outer surface of the inner distributor ring and the intermediate distributor ring. an outer distributor ring; an intermediate distributor ring mounted within the outer distributor ring, wherein the first fluid circuit is defined between the intermediate and outer distributor rings; and an inner distributor ring mounted within the intermediate distributor ring, wherein the second fluid circuit is defined between the intermediate and inner distributor rings; wherein the outer distributor ring includes an internal conical surface with a helically threaded fluid passage defined therein, and wherein the first fluid circuit is defined between a helically threaded fluid passage of the internal conical surface of the outer distributor ring and an outer conical surface of the intermediate distributor ring; and wherein the inner distributor ring includes an outer surface with a helically threaded fluid passage defined therein, and wherein the second fluid circuit is defined between a helically threaded fluid passage of the outer surface of the inner distributor ring and the intermediate distributor ring.