Abstract: A needle housing (1) comprises a conical wall portion (2) and a cylindrical wall portion (3) with annular skirt (4) and annular base (5). Base (5) has located beneath it a layer of an adhesive impregnated material (6) or alternatively a roughened anti-slip friction surface. An internal annular rib (7) extends inwardly from skirt (4). Annular rib (7) is adapted to frictionally engage surface (16) of the external peripheral surface of needle boss (12) prior to use. Located above rib (7) is an O-ring (13). O-ring (13) is discarded upon removal of needle boss (12) from housing (1). Housing (1) is attached or otherwise supported above a fixed horizontal surface prior to removal of needle (10) and needle boss (12) for use. After use the boss (12) and needle (10) are reinserted into housing (1) so as to be safely retained therein beneath rib (7).