a connector having a first end, a second end, a shoulder located between the first end and the second end, and a first segment extending from the shoulder to the first end, the first segment having an outer surface that includes external threads extending circumferentially along the outer surface;

a first seal member formed of an elastically deformable material, the first seal member surrounding a portion of the first segment adjacent the shoulder, the first seal member having an inner surface in contact with the external threads of the first segment, an outer edge opposite the inner surface, and first and second seal ends joining the inner surface and the outer edge, wherein the first seal end abuts against the shoulder; and

a fastener member threadably secured to the first end of the connector, the fastener member having an end,

wherein the end of the fastener member contacts the second seal end such that the first seal member is compressed between the end of the fastener member and the shoulder, and deforms in a radially inward direction such that the inner surface of the first seal interfaces with the external threads of the first segment,

and wherein the first seal member forms a liquid-tight compressive seal between the shoulder and the end of the fastener member.