123 opening and be sealed at the other end provided that the length of the tube 120 is sufficient to accept distal portion 201 the outer diameter of tube 120 preferably ranges in diameter from about 0 18 inches to about 0 375 inches the length of tube 120 preferably ranges from about 10 inches to about 15 inches tube 120 is preferably fabricated from a flexible polymeric material such as polyethylene fluorocarbon polymer e g teflon u00ae brand polytetrafluoroethylene polyvinyl chloride 34 pvc 34 nylon or any other material suitable for the purposes described herein alternatively guide tube 120 can be relatively rigid enough to withstand kinking referring to fig1 and 3 second portion 112 is optionally semicircular in shape and preferably includes at least one and preferably two or more projection such as overhang flanges 113 which define an undercut region 114 flanges 113 provide snap fit retaining means to releasably hold tube 120 in place within cavity second portion 112 of the depression flanges 113 can be formed as a shaped integral portion of the tray 102 during the thermoforming process tube 120 is positioned in curved second portion 112 of the depression 110 as seen in fig3 tube 120 is at least partially lodged in the.