A simple block to help simplify the feed of multiple filaments out of a dry box.  PTFE tubes come from each filament roll to the block.  Each position has a push lock fitting on the exit of the block.  When changing filament just plug in the feed tube from the printer to the filament you want. 

One side of the block is sized for the 4mm OD PTFE tubes to press in and the other for the push lock fittings to be threaded in.

Uses PC4-M6 fittings - thread M6/3mm, inner diameter(blue end) 4mm.

The pegs used to plug the fittings are 3d printed as well using the OD dimension from the tubing. Unfortunately I didn't save the drawing.