SS-4M0-1-4RT | Swagelok | Tube Fitting Male Connector 4mm Tube OD x 1/4 In. Swagelok SS-4M0-1-4RT. Is Swagelok SS-4M0-1-4RT not the part you are wanting?. Tube Fitting. Male Connector. 4mm Tube OD x 1/4 In.