Attaching Surgical tubing together??

[IronMustang9]

We just use single overhand knots and leave an inch or so of loose ends on both sides intentionally in our prototype and it seems to work fine. The bulky knot and ends help to scoot the fuel balls into and thru the double roller intake we are testing. If using this idea just be careful those loose ends don't whip out and extend past your overall envelope as I understand that is a no-no. No knots have come undone yet but there is only less than an hour on them running constantly.