Flange fitting with leak sensor port

An attachment flange (206) with a leak detection feature for inner fluid conduit (202) and an outer fluid conduit (204) surrounding the inner fluid conduit, including the attachment tab; a body flange having an inner portion (218) around a hole (214) of the inner fluid conduit, and having an outer portion (220) around a hole (216) of the outer fluid conduit, the body having a front flange sealing surface (222) configured to engage a cooperating flange fitting; a step of detecting endoleaks (234) formed in the inner portion (218) of the flange body, ending the step of detecting endoleaks at the front sealing surface (222); and an opening detection endoleaks (230) formed in the inner portion body tab, the detection hole internal leakage in fluid communication with the passage detection endoleaks (234), and being configured hole detecting endoleaks for fluid communication with leak detection apparatus.