Devices and methods are provided for delivering fluid components of an embolic mass into a body cavity. A connector, which includes a receiving element, a first port, and a second port, is provided for securing an outer tubular element and an inner tubular element such that the outer tubular element coaxially surrounds the inner tubular element. The first port is in fluid communication with the lumen of the outer tubular element when the outer tubular element is secured to the receiving element; and the second port is in fluid communication with the lumen of the inner tubular element when the inner tubular element is secured to the connector. First and second fluid components of an embolic composition are delivered into the first and second ports of the connector and through the lumens of the outer and inner tubular elements for occlusion of the body cavity.