the interior rim 53 of cap 50 cap 50 may be securely attached to the top housing 40 by any conventional means and may be configured to make a snap fit connection central passageway 51 extends to the proximal side of cap 50 and permits entry of an elongated object into the winepress assembly 100 the cannula assembly 1 contains a central corridor which is only closed by lips 23 on duckbill valve 20 referring now to fig2 in conjunction with fig1 the winepress assembly 100 of the present disclosure will be described in greater detail winepress assembly 100 includes an elastomeric seal 110 a lower or leading end cap 120 a liner 130 a spoke tube 140 and an upper or trailing end cap 150 each component of winepress assembly 100 is in general alignment with the central longitudinal axis u201c k u201d of cannula 1 and includes a central shaft which allows an elongated object to pass through elastomeric seal 110 includes throat 111 which extends the entire length of elastomeric seal 110 to accept an elongated object inserted there through elastomeric seal 110 is bowed inward near its midpoint to give it an hourglass shape such that a minimum interior throat diameter near the center may sealingly engage the elongated object as discussed below the flexibility of elastomeric seal 110 allows the minimum interior throat diameter to be modified to be used with variously sized objects also included on elastomeric seal 110 are lower and upper collars 113 117 protruding radially from the throat 111 at the distal or leading and proximal or trailing ends respectively lower and upper collars 113 117 include lower and upper beads 115 119 protruding from.