PURPOSE: To provide a mount capable of easily changing a dimension of a narrow passage.

CONSTITUTION: A hydraulic antivibration mount is composed of two rigid tubular end pieces 1, 2 one surrounding the other. The end pieces are connected to each other by an elastomer body 3 shaped so as to form fluid-tight pockets facing in a diameter direction and communicating with each via through a narrow channel 7. The pockets and the channel are filled with a damping liquid. Exterior of the narrow passage 7 is defined by a tubular inner face 10 of a central portion of the tubular internal end piece 1, and interior of the narrow channel 7 is defined by a groove 8 formed in a tubular outer face of a ring 9. The tubular internal end piece is shaped to provide an axial inlet 13 large enough to permit access to the ring 9 and a tubular case 10 at a terminal of the inlet adapted for accepting the pressed-in ring.