A connector assembly, comprising: a first connector element comprising a sidewall extending between a proximal end and a distal end and defining an internal passage therebetween, the sidewall having a radially outward-extending flange surrounding a discharge tip at the distal end and wherein the first connector element is configured as part of a conical cap body in which the internal passage is a conical interior cavity and the conical cap body has a discharge outlet, defining the internal passage, in fluid communication with the conical interior cavity; and a second connector element removably attachable to the discharge outlet of the first connector element, the second connector element comprising a central body having a distal portion and a proximal portion, the proximal portion configured to be at least partially positioned within the internal passage of the discharge outlet, and the second connector further has an annular connector ring connected to and surrounding the central body and configured to releasably engage an exterior of the radially outward-extending flange when the second connector element is attached to the first connector element, the central body defining the internal channel within the central body that is in fluid communication with the conical interior cavity of the conical cap body when the second connector element is attached to the first connector element at the discharge outlet, the annular connector ring is elliptical and comprises: two major vertices; two minor vertices; at least two radially inward-extending flanges on the minor vertices releasably engaging the radially outward extending flange on the discharge tip of the first connector element when the second connector element is attached to the discharge outlet and detachable from the radially outward-extending flange by flexing the annular connector ring by pressing the major vertices inward toward the central body; characterized by at least two radially and proximally extending curved arms, each arm having a first end connected to the central body and a second end connected to one of the minor vertices of the annular connector ring. a first connector element comprising a sidewall extending between a proximal end and a distal end and defining an internal passage therebetween, the sidewall having a radially outward-extending flange surrounding a discharge tip at the distal end and wherein the first connector element is configured as part of a conical cap body in which the internal passage is a conical interior cavity and the conical cap body has a discharge outlet, defining the internal passage, in fluid communication with the conical interior cavity; and a second connector element removably attachable to the discharge outlet of the first connector element, the second connector element comprising a central body having a distal portion and a proximal portion, the proximal portion configured to be at least partially positioned within the internal passage of the discharge outlet, and the second connector further has an annular connector ring connected to and surrounding the central body and configured to releasably engage an exterior of the radially outward-extending flange when the second connector element is attached to the first connector element, the central body defining the internal channel within the central body that is in fluid communication with the conical interior cavity of the conical cap body when the second connector element is attached to the first connector element at the discharge outlet, the annular connector ring is elliptical and comprises: two major vertices; two minor vertices; at least two radially inward-extending flanges on the minor vertices releasably engaging the radially outward extending flange on the discharge tip of the first connector element when the second connector element is attached to the discharge outlet and detachable from the radially outward-extending flange by flexing the annular connector ring by pressing the major vertices inward toward the central body; characterized by at least two radially and proximally extending curved arms, each arm having a first end connected to the central body and a second end connected to one of the minor vertices of the annular connector ring. two major vertices; two minor vertices; at least two radially inward-extending flanges on the minor vertices releasably engaging the radially outward extending flange on the discharge tip of the first connector element when the second connector element is attached to the discharge outlet and detachable from the radially outward-extending flange by flexing the annular connector ring by pressing the major vertices inward toward the central body; characterized by at least two radially and proximally extending curved arms, each arm having a first end connected to the central body and a second end connected to one of the minor vertices of the annular connector ring.