From 
Image 1 of 16
Planning a micro irrigation system
Image 2 of 16
Starting from the faucet:
A. Battery-operated controller turns the water on and off at specified times. This is optional but should be the first component.
B. Backflow preventer protects your household water from accidental contamination.
C. Filter screens out particles that could clog the holes in the drip parts.
D. Pressure regulator reduces the high house pressure to the lower pressure required by drip systems.
E. Adapter connects the 1/2-in. plastic (polyethylene) tubing to the hose threads on the pressure regulator.
A. Battery-operated controller turns the water on and off at specified times. This is optional but should be the first component.
B. Backflow preventer protects your household water from accidental contamination.
C. Filter screens out particles that could clog the holes in the drip parts.
D. Pressure regulator reduces the high house pressure to the lower pressure required by drip systems.
E. Adapter connects the 1/2-in. plastic (polyethylene) tubing to the hose threads on the pressure regulator.
Image 3 of 16
BARBED CONNECTOR
Image 4 of 16
Drippers, bubblers, sprinklers and sprayers:
One of the first things you’ll notice when you’re browsing the brochures or Web sites is a wide variety of watering devices. Here are the basic types and a few things you need to know about each one. While the ones shown here are the most common, there are many other, more specialized emitters. See the micro irrigation catalogs for the other types and their uses.
Image 5 of 16
Use these to water individual plants, or buy "inline" drippers and use them in a series with a 1/4-in. tube. Drippers work great for container plants too. They’re color-coded for different flow rates between 1/2 gph (gallons per hour) and 4 gph. In general, use lower flow rates for less porous soil, like clay, to allow more time for the water to soak in. Buy pressure-compensating (PC) drippers to maintain a steady flow despite the water pressure.
Image 6 of 16
Soaker drip line (20¢ to 35¢ per linear foot): Also called emitter tubing, drip line consists of 1/2-in. or 1/4-in. tubing with builtin drippers. It’s available with emitters spaced different distances apart for different flow rates. Drip line is great for vegetable gardens or rows of plants. You can use it to encircle shrubs and large plants, or lay it out in a grid pattern as a substitute for sprinklers in a densely planted flowerbed. Use 1/4-in. drip line for maximum flexibility.
Image 7 of 16
Mike Krivit
Bubblers (45¢ to 70¢ each): A cross between drippers and sprayers, many bubblers are adjustable for flows up to 35 gph and diameters to 18 in. Since they put out more water than drippers, they’re good for larger plants like roses, tomatoes and shrubs.
Image 8 of 16
Sprinklers (45¢ to $2 each): These are miniature versions of sprinklers you might use in the yard. Most have flow rates between 14 and 40 gph and cover a radius of 3 to 30 ft. Since most sprinklers have a relatively high flow rate, you can’t use more than about 15 or 20 in one zone of 1/2-in. tubing.
Image 9 of 16
Sprayers (45¢ to $1.70 each): These are like sprinklers without moving parts. You can choose a spray pattern from a quarter circle up to a full circle, or buy sprayers with adjustable spray patterns. They spray from 4 to 34 gph and up to a radius of about 12 ft. Use sprayers to water ground cover or densely planted flowerbeds.
Image 10 of 16
1. Mount a "Y" with shutoff valves to your faucet. Then attach the optional timer, backflow preventer, filter, pressure regulator and adapter.
Image 11 of 16
2. Connect the 1/2-in. poly tubing to the faucet end. Then lay the tubing through the garden according to your plan. Stake it down about every 5 or 6 ft.
Image 12 of 16
3. Cut the tubing with a pruning shears and install T- and 90-degree fittings where they’re needed. Twist and press the tubing firmly into the fitting.
Image 13 of 16
4. Punch holes in the tubing wherever you want to install a watering device. Push and twist until the tip of the punch creates a clean hole.
Image 14 of 16
5. Press a barbed connector into the hole in the 1/2-in. tubing. If the 1/4-in. tubing isn’t already attached, add a length of 1/4-in. tubing to reach your dripper, sprayer or sprinkler location.
Image 15 of 16
6. Press pressure-compensating (PC) drippers, sprinklers or sprayers onto the end of the 1/4-in. tubing. Use a stake to support the dripper and anchor it in the root zone of the plant.
Image 16 of 16
7. Flush the system by running water through it. Then use end cap fittings to close the open ends of the 1/2-in. tubing.
Comments :