A feedthrough , comprising: first and second parts , each including a flange with an opening , therethrough, and a tubular segment extending normally from a first surface of the flange and having a lumen disposed generally concentrically with the opening ; and a pair of complementary engaging mechanisms , each disposed on a distal end portion of a respective one of the tubular segments and configured to couple the first and second parts together through an opening in a panel having opposite sides in a snap-together fashion, such that: the first surface of each of the flanges is held adjacent to a corresponding one of the opposite surfaces of the panel ; and the lumens of respective ones of the tubular segments are disposed generally concentrically with each other; wherein at least one of the engaging mechanisms comprises fingers extending longitudinally from a distal end of an associated one of the tubular segments , the fingers 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 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 , each including a flange with an opening , therethrough, and a tubular segment extending normally from a first surface of the flange and having a lumen disposed generally concentrically with the opening ; and a pair of complementary engaging mechanisms , each disposed on a distal end portion of a respective one of the tubular segments and configured to couple the first and second parts together through an opening in a panel having opposite sides in a snap-together fashion, such that: the first surface of each of the flanges is held adjacent to a corresponding one of the opposite surfaces of the panel ; and the lumens of respective ones of the tubular segments are disposed generally concentrically with each other; wherein at least one of the engaging mechanisms comprises fingers extending longitudinally from a distal end of an associated one of the tubular segments , the fingers 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 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 of each of the flanges is held adjacent to a corresponding one of the opposite surfaces of the panel ; and the lumens of respective ones of the tubular segments are disposed generally concentrically with each other; wherein at least one of the engaging mechanisms comprises fingers extending longitudinally from a distal end of an associated one of the tubular segments , the fingers 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 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. <EOS>