We have had several people ask us this so here it goes. For the Malibu MLS, the original fill tube is in the front. We didn't care for that since it is difficult to reach, secure, and connect the fittings to the bag that far up in the locker (there is no access). To install our bag, the front tube can be simply routed to the rear of the bag, behind the dividing wall. We typically drill a hole into the dividing wall above the existing drain hole. We then install the fill line through that hole and install the blue fitting forward of the dividing wall. I don't see any problem with installing the blue fittings behind the dividing wall as long as the holes are not too rough.
We sincerely apologize for the confusion to those of you who have these bags and our instructions will be updated accordingly. Feel free to contact us at 800-284-6615 if you have any more questions.
Fluid Concepts www.fluidconcepts.net