Abstract: A pipe hanger (10, 110, 210) comprising hanger rail(s) (16, 116, 216) secured at one end to a floor joist (18) so as to depend downwardly from underneath the floor structure, a first bracket member (20a, 120a, 220a) having at least one longitudinal bore through which the hanger rail(s) is received and a notch (24, 124, 224) formed in one surface of the bracket member thereof. In communication with each longitudinal bore of the bracket member is a latching mechanism (26, 126, 226) which secures the bracket member to the hanger rail(s) such that the bracket member can freely move along the hanger rail(s) in one direction but is prevented from moving along the hanger rail(s) in the opposite direction without actuating a lever on either side of the bracket member. A second bracket member (20b, 120b, 220b) which is identical to the first, but rotated 180.degree.