A feedthrough, comprising: first and second parts (202, 204), each including a flange (206, 208) with an opening, therethrough, and a tubular segment (214, 216, 314, 316, 416, 418, 514, 516, 614, 616) extending normally from a first surface of the flange and having a lumen (222, 224) disposed generally concentrically with the opening (210, 212); and a pair of complementary engaging mechanisms (226, 228, 326, 328, 526, 528), each disposed on a distal end portion of a respective one of the tubular segments (214, 216, 314, 316, 416, 418, 514, 516, 614, 616) and configured to couple the first and second parts (202, 204, 402, 404, 602, 604) together through an opening in a panel having opposite sides in a snap-together fashion, such that: the first surface (218, 220) of each of the flanges (206, 208) is held adjacent to a corresponding one of the opposite surfaces of the panel; and the lumens (222, 224) of respective ones of the tubular segments are disposed generally concentrically with each other; wherein at least one of the engaging mechanisms (226, 228, 326, 328, 526, 528) comprises fingers (554, 654) extending longitudinally from a distal end of an associated one of the tubular segments (214, 216, 314, 316, 416, 418, 514, 516, 614, 616), the fingers (554, 654) being arranged to be received in corresponding longitudinal slots disposed in the outer circumferential surface of the other one of the tubular segments, and wherein a distal end portion of each of the fingers (554, 654) is provided with a radially extending tooth that is arranged to be received in a corresponding through-slot in a sidewall of the other one of the tubular segments in an over-center locking engagement. first and second parts (202, 204), each including a flange (206, 208) with an opening, therethrough, and a tubular segment (214, 216, 314, 316, 416, 418, 514, 516, 614, 616) extending normally from a first surface of the flange and having a lumen (222, 224) disposed generally concentrically with the opening (210, 212); and a pair of complementary engaging mechanisms (226, 228, 326, 328, 526, 528), each disposed on a distal end portion of a respective one of the tubular segments (214, 216, 314, 316, 416, 418, 514, 516, 614, 616) and configured to couple the first and second parts (202, 204, 402, 404, 602, 604) together through an opening in a panel having opposite sides in a snap-together fashion, such that: the first surface (218, 220) of each of the flanges (206, 208) is held adjacent to a corresponding one of the opposite surfaces of the panel; and the lumens (222, 224) of respective ones of the tubular segments are disposed generally concentrically with each other; wherein at least one of the engaging mechanisms (226, 228, 326, 328, 526, 528) comprises fingers (554, 654) extending longitudinally from a distal end of an associated one of the tubular segments (214, 216, 314, 316, 416, 418, 514, 516, 614, 616), the fingers (554, 654) being arranged to be received in corresponding longitudinal slots disposed in the outer circumferential surface of the other one of the tubular segments, and wherein a distal end portion of each of the fingers (554, 654) is provided with a radially extending tooth that is arranged to be received in a corresponding through-slot in a sidewall of the other one of the tubular segments in an over-center locking engagement. the first surface (218, 220) of each of the flanges (206, 208) is held adjacent to a corresponding one of the opposite surfaces of the panel; and the lumens (222, 224) of respective ones of the tubular segments are disposed generally concentrically with each other; wherein at least one of the engaging mechanisms (226, 228, 326, 328, 526, 528) comprises fingers (554, 654) extending longitudinally from a distal end of an associated one of the tubular segments (214, 216, 314, 316, 416, 418, 514, 516, 614, 616), the fingers (554, 654) being arranged to be received in corresponding longitudinal slots disposed in the outer circumferential surface of the other one of the tubular segments, and wherein a distal end portion of each of the fingers (554, 654) is provided with a radially extending tooth that is arranged to be received in a corresponding through-slot in a sidewall of the other one of the tubular segments in an over-center locking engagement.