Heavy Duty XL Black Silicon Tubing
Manufacturer part number: 5054K531
Quick overview High-Temperature Silicone Rubber Tubing for Water, Soft, Durometer 50A, Opaque Black, 4 mm ID, 8 mm OD Thicker than the Dubro XL water line . Still very flexible . Can maintain a tight radius without kinking or collapsing . Priced per foot .