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Overall view of the hypergol manifold.

Picture 3 of 3.

A cartridge containing a fluid hypergolic with oxygen (also known as pyrophoric, igniting spontaneously with an oxygen source; triethylaluminum [TEA] was commonly used in missile rocket engines for this purpose) was installed in the hypergol manifold. High-pressure fuel was tapped off of the fuel inlet manifold, directed through the hypergol manifold. Once fuel pressure became sufficiently high, it ruptured a burst disc in the hypergol manifold, releasing the hypergolic fluid into the injector, where it mixed with the LOX and provided an ignition source. Fuel soon entered the combustion chamber to sustain the ignition.

Note the lockpin securing the hypergol cartridge in the container.