I made some special large volume tubes to do stand development. My regular tubes for 4x5 were made from 1.5 inch ABS pipe. For the stand development I used 2 inch ABS. The caps were made from a section of pipe also. This way each tube will hold about 300 mL of liquid. It also works very well with highly dilute developers like Rodinal at 100:1 with intermittent agitation.