4mm to 6mm OD PTFE Teflon Filament Tube Coupler / Joiner

This is a 4mm to 6mm OD PTFE/Teflon filament tube coupler / joiner I designed that does just that. It joins two pieces of filament tube together, one with 4mm OD to another with 6mm OD. The filament tubes press fit into the coupler and should fit quite snug without deformation. The tubes insert ~12-14mm into each side for a good fit.