CHECK TUBING SIZE BEFORE PURCHASE: Fits ONLY tubing with ID 0.52-0.55" (13.2-14mm) / OD 0.62-0.65" (15.7-16.5mm). NOT compatible with Generic tubing (ID 0.6" / 15mm, OD 0.7" / 17.8mm). PACKAGE LIST - It comes with 16 pieces barbed locked coupling connectors, which let you connect your irrigation systems as you wish. MADE OF DURABLE PLASTIC MATERIAL - The drip line nuts connectors are made of high quality engineering plastics, so our drip barbed connectors are durable, strong, water resistant, chemical-resistant and long-lasting than others. EASY TO INSTALL - It is easy to install without any glue, tools or clamps. Directly insert this irrigation tubing two sides at the ends of the water pipe, the barbed ends can grab 1/2" tubing tightly for a secure leak-proof connection. WIDE APPLICATION - These drip irrigation pipe fittings for 1/2 inch sprinkler hose are ideal for garden, flower bed, greenhouse, farm, lawn, patio and other agricultural watering system. Please confirm the size of your drip tube before purchase.Our product is compatible with 1/2 inch drip irrigation tube which is 0.52" to 0.55" inner diameter and 0.62"-0.65" outer diameter.