1 Metre Of 2mm ID x 4mm OD Flexible Silicone Rubber Tube / Tubing (Sourcingmap)
2mm ID x 4mm OD 3.3' Flexible Silicone Rubber. Note: Silicone tube is much softer than pvc tube or nylon tube. Silicone rubber tube - will withstand repeated use and for visual inspection of fluids.