Check the listing for details. Universal Nut Lock Coupling 1/2 in. Polypropylene Drip Irrigation Fittings New. Condition: New. Listed at 7.13 USD. DIG NUT LOCK COUPLING - SINGLE UNIT The DIG Universal Coupling is designed to connect any size of 1/2 in. poly tubing regardless of tubing's specific inner or outer diameter. Provides a secure, water tight fit without the use of glues or special tools. Made from rugged, UV resistant plastic. Disassembles easily for maintenanceConnects any 1/2 in. drip tubingUniversal nut lock system offers a tight fit regardless of the size of the tubingMade from high quality, durable materials to ensure a long life in the landscape Universal Nut Lock Coupling 1/2 in. Polypropylene Drip Irrigation Fittings New 1/2 in. Universal Nut-Lock Coupling The DIG Universal Coupling is designed to connect any size of 1/2 in. poly tubing regardless of tubing's specific inner or outer diameter. Provides a secure, water tight fit without the use of glues or special tools. Made from rugged, UV resistant plastic.Disassembles easily for maintenanceConnects any 1/2 in. drip tubingUniversal nut lock system offers a tight fit regardless of the size of the tubingMade from high quality, durable materials to ensure a long life in the landscape