Thanks everyone for helping so far, but of course I still have questions.
When putting connectors together does it matter if they are butted up against each other? I just want to make sure I do the plumbing correctly. I have a coupler at the top, then a ball valve and after that a Tee. One of the outlets of the tee I have another ball valve to control water going into the refuge. I was going to put regular PVC between the pieces, butting the ends together and then from the tee use the SPAFlex. Is that ok to do? Doing it this way I'd have more room above the refuge/sump area.