Lock-Nut Irrigation Tee with 1/2-Inch Male Thread, 16 or 20 mm

Connect a threaded branch to two line ends

This lock-nut irrigation tee combines two opposing line connections with a half-inch male threaded branch. The straight arms keep the two line sections aligned, while the central branch meets a suitable female-threaded connection. Blue retaining nuts secure the line ends on the black tee body. This arrangement is useful where a threaded outlet needs to feed two directions along an irrigation row.

Choose the line size and check the thread

Select 16 mm or 20 mm to match the line you intend to connect. Both available options use a half-inch male branch. The line diameter and thread size describe different parts of the fitting, so check both against the components in your system. Confirm the female thread standard and sealing method before installation; a half-inch description alone does not establish compatibility with every threaded accessory.

Prepare a supported irrigation joint

Plan the tee position so neither line pulls sideways on the threaded branch. Make clean, square cuts and remove grit from the line ends. Seat each matching line fully, then secure the retaining nuts without distorting the connection. Assemble the threaded joint using the sealing method appropriate to the mating fitting. Start the watering run gradually and inspect all three connections for seepage. If a joint leaks, stop the water and check alignment, line fit and seating before tightening further. Check the tee again after moving nearby lines or servicing the row.