A one-piece fluid line connector 10 for connecting a fluid feed line to a fluid container, comprising a main body 110 having a male luer lock fitting 112, and a cap 120 coupled to the main body 110 by a living hinge 130. The living hinge 130 is moveable to an aligned position in which the cap 120 is aligned with a central axis of the male luer lock fitting 112 of the main body 110. The cap includes a through-hole 124 configured that in the aligned position, the shape of the through-hole permits a correspondingly-shaped female luer lock fitting to pass there through and engage the male luer lock fitting. A fluid line connector system is also claimed having a female luer lock fitting having a connector and one or more lugs (figures 6A-9A) wherein the lugs are positioned to correspond to the shape of the through-hole 124 and be able to pass through when the cap 120 is in the aligned position.
