A connector is provided for coupling an end of a coaxial cable to a terminal. The connector includes a coupler having an annnular collar, a body member, one end of which includes a deformable lip inserted with elastic deformation through the collar opening, and a post. In a cable-installed position, the post is received in the body member to form an annular chamber sufficiently narrow in the cable-installed position to compress the outer conductor and the jacket for establishing a distal seal. Tightening of the coupler to the terminal compresses the lip between the post flange and the annular collar for establishing a proximal seal.