Product includes: Bag of 20. Fits most 1/2" and 1/4" drip tubes (0.51 ID to 0.15 ID) < p>Working pressure: up to 45 PSI, bag of 8. One 1/2" tube can be divided into four 1/4" tubes. For use with drippers, drip tubes and drippers. Anti-fall design: safe and easy to install. Push the barbed tee into the tube. Close the tube with the screw cap. HIGH QUALITY: High quality material, recycled materials. Our barbed tees are made of high quality materials and we have increased the wall thickness. It is durable. Applications: Ideal for raised beds, residential, agricultural, greenhouse horticulture and agricultural irrigation applications.