1/4" red RO tubing Rating: Select ratingGive it 1/5Give it 2/5Give it 3/5Give it 4/5Give it 5/5 Average: 5 (3 votes) (0 reviews) Order this red tubing by the foot $0.70 SKU: 30011 Order this red tubing by the foot.Polypropylene food-grade tubing, 1/4" ID.