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Hello @Garry60
Thanks for sharing your question about poly pipe. The main difference between 13 mm and 19 mm poly pipe for garden bed watering is really about how much water each size can carry and how far it can deliver it, and choosing between them comes down to the size of your setup and how many outlets you want to run. Thirteen-millimetre poly is the lighter, more flexible option and is great for smaller beds or short runs. It is easy to work with, pairs nicely with drippers and micro sprayers, and does a lovely job when you only need to water a modest area. Because it doesn’t hold as much water, the pressure drops a little quicker over long distances, so it is best used when everything is fairly close together.
Nineteen-millimetre poly steps in when you need something a bit more robust. It carries more water with less pressure loss, which makes it ideal for bigger beds, longer runs, or systems that branch off in multiple directions. Even though it is slightly firmer to handle, it provides a strong, reliable mainline that keeps water flowing evenly to all your smaller offshoots. This becomes especially helpful when you are running several drippers or sprayers at once and want consistent performance.
As a friendly guide, think of 13 mm as your go-to for compact areas and 19 mm as the right choice when you want room to grow or need dependable pressure across a wider layout. Both sizes will serve you well; it is just about matching the pipe to your garden’s needs so everything gets the water it deserves.
Here is a handy guide that will help: How to install a drip irrigation watering system by @Adam_W.
If you need further assistance, please let us know.
Eric
