Abstract: An IV set includes a drip chamber having a top end and a bottom end. A spikeless connector covers the top end, and an IV tube is connected to the bottom end of the drip chamber. The end of the IV tube opposite the drip chamber is engaged with a needleless/spikeless connector. Thereby, a needleless/spikeless IV set is rendered. A reflux valve including a deformable valve member and reciprocating valve element is also disclosed for use in conjunction with the needleless/spikeless IV connectors.