1/4" black RO tubing Rating: Select ratingGive it 1/5Give it 2/5Give it 3/5Give it 4/5Give it 5/5 Average: 4.8 (4 votes) (0 reviews) Order this black tubing by the foot $0.70 SKU: 30010 Order this black tubing by the foot.Polypropylene food-grade tubing, 1/4" ID.