irrigation nozzle for my raised beds

This is part of my garden irrigation system.
Nozzle has a 1/2 inch thread. I connect them using such tees with a thread:
https://www.ebay.com/itm/5pcs-1-2-Male-Thread-to-20mm-Connector-Micro-Irrigation-Tee-PE-Pipe-Barbed/113657450808?hash=item1a76831138:m:mTPG58s2VsEouS2fUsahRSw

Irrigation is supplied from 1000l of tank raised to a height of 1.5m. The system pressure is quite low, but enough to watering the beds.

Soon I will also add electric valves controlling my system with arduino