Go to Home Depot or Lowes and buy a replacement dishwasher drain hose. The kind with the big rubber boot that fits on the nipple on the disposal. Cut off the hose from the disposal fitting and use the the disposal piece for the drain. This fits just right on the a/c box nipple and is the right length to poke through the floor. Works great.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech