Continue shopping “KWIK DRAW 1,3-Butadiene, 100-1,200 ppm, 1-Butylene, 100-5,000 ppm, 2-Butylene, 200 – 5,000 ppm, Ethylene 25-5,000 ppm, Isobutylene 400-2,600 ppm, Propylene 20-5,000 ppm Detector Tubes, 10 per box, 24 month shelf life” has been added to your cart.