# A summer garden water line from HDPE pipe: a DIY guide

> How to build a summer garden water line: which HDPE pipe to use, standpipes on compression fittings, and why it needs a fall and a drain valve.

Web page: https://watertrade.com.ua/en/articles/article/letnij-vodoprovod-na-dache · Other languages: [UA](https://watertrade.com.ua/articles/article/letnij-vodoprovod-na-dache.md), [RU](https://watertrade.com.ua/ru/articles/article/letnij-vodoprovod-na-dache.md)

*November 12, 2026*

![Diagram: an HDPE main laid with a fall across the plot, standpipes with taps on compression tees, a drain valve at the lowest point and a pump by the house](https://watertrade.com.ua/uploads/articles/summer-garden-water.jpg)

A summer water line saves you dragging hoses across the plot: you take water from a tap by the vegetable beds, the gazebo or the outdoor shower. It can be built in a weekend from polyethylene pipe and compression fittings — no welding and no special tools. The key is to plan from the start how you will drain it in autumn.

## What the diagram shows

1 — the HDPE main laid with a fall, 2 — a standpipe with a tap on a compression tee, 3 — a drain valve at the lowest point, 4 — the pump or tank by the house.

## What you need

- **HDPE pipe**, 25 or 32 mm for the main and 20 mm for the branches. Black water pipe is UV-resistant and can lie directly on the ground.
- **Compression fittings:** tees, elbows, threaded adapters and end caps. They assemble by hand, come apart and can be reused.
- **Taps** for the standpipes, plus one drain valve.
- **A water source:** a booster set, a submersible pump in a well, or a raised tank.

## Step-by-step installation

1. Sketch the plot: where the source is, where you need taps and how the main will run. Try to give the pipe a slight fall in one direction, towards the drain valve.
2. Lay the main on the ground or in a shallow trench. Where people walk or drive over it, bury it deeper or protect it with a board.
3. Fit compression tees where the standpipes go. Run the branch upwards, fix it to a stake or post and put a tap on top.
4. At the lowest point, fit a tee with a drain valve, or simply a valve on the end of the main.
5. Connect the main to the pump through a valve and, if the water is sandy, through a mesh filter. Turn on the water and check every joint.

> Tighten a compression fitting nut by hand, then add no more than half a turn with a spanner. An overtightened nut cracks; an undertightened one leaks and can let the pipe pull out under pressure.

## In autumn: drain the water

Water left in the pipe will freeze in winter and split the fittings and taps. Shut off the supply, open every standpipe tap and the drain valve — thanks to the fall, the water runs out by itself. You can even take the compression fittings apart for the winter. More on preparing plumbing for the cold in [“How to winterise cottage plumbing”](https://watertrade.com.ua/en/articles/article/konservaciya-vodoprovoda-na-zimu).

For watering beds, try [drip irrigation](https://watertrade.com.ua/en/articles/article/kapelnyj-poliv-iz-baka). HDPE pipe, compression fittings and taps are in pipes and fittings.

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