Lock-Nut Male Thread Adapter — 16 mm or 20 mm

A lock-nut male thread adapter connects a drip line to a compatible female-threaded irrigation fitting. One end retains the line with a blue nut; the other carries the male thread. Select the complete combination of line diameter and thread size to match both sides of the connection.

A locking line connection and a male thread

The view shows the projecting line insert inside the blue nut and the male-threaded end across the ribbed black center. The line fits onto the insert and is retained by its nut. The threaded end connects to the matching female component, creating a straight transition in the irrigation layout.

Connection details

• 16 mm line × 1/2-inch male thread.
• 16 mm line × 3/4-inch male thread.
• 20 mm line × 1/2-inch male thread.

Choose and position the fitting

Check the actual line dimensions and wall construction before assembly. Confirm the mating thread standard as well as the nominal size; matching size labels alone do not establish that two threads will seal correctly. Position the adapter so both the locking nut and threaded joint remain accessible, with the line supported nearby.

Fit and inspect the joints

Shut off the supply and release pressure. Start the male thread carefully in the female fitting and use the sealing method appropriate to the confirmed thread type. Avoid overtightening the plastic body. Cut the line square, seat it fully on the insert and secure the retaining nut without twisting or folding the line. Restore water gradually and inspect both connections during the first watering run.

Sold as one fitting. Line, mating components and installation accessories are separate.