Automatic Digital Tap Timer

The next generation of tap mounted automatic timers. This product provides easy to install and easy to use solutions for watering pots, hanging baskets, shrub areas, flower beds and small lawns. No plumber or electrician required. Battery operated and featuring low energy use with patented eco-friendly battery life monitoring and display.

  • Requires 1x 9V alkaline battery
  • Easy programming using 6 buttons and large LCD display with intuitive prompting
  • Automatic operation with manual override
  • 600kPa max. operating pressure for reliable operation
  • Do not use in freezing conditions
  • 3° min working temperature

Available at Bunnings
SKUCO1605 Categories, Tags,
Barcode: 9319841040443
Additional information
Weight0.24 kg
Dimensions111 × 85 × 165 mm


Model NumberCO1605
Fitting Size12mm
Above GroundYes
Minimum Pressure (kPa)100
Maximum Pressure (kPa)600
Flow Rate
Water Pressure (kPa)L/min


My tap timer makes a funny noise and does not open.

If that is the case please try the following recommended solutions:

  • If you are running a low pressure drip system, you need to install an Air Release Valve (102646) at the highest point of your system and above your drippers.
  • This breaks this the air in the drip line and allows to suck in air through the air release valve and prevents the drippers from blocking due to dirt.
    This also allows for the diaphragm to work properly.

Can I run this off a gravity-fed or low-pressure system?

  • This timer is not suitable for low pressure applications. It is designed for normal tap pressure 250kPa to 600kPa.

If I use my timer manually, will I need to re set my timer?

  • No. If you press the ON/MANUAL button, your timer will run for the duration set then turn off. This will not affect the program.

My timer shows it is watering but there is no water coming thru?

  • There may be an airlock in the system. Disconnect the timer and reset it. Flush your irrigation system before attaching to the timer again.

My timer will not turn off after the programmed run time?

  • Setting multiple start times or incorrect programming may have been entered.
  • When going thru the programming of your timer, you first set your current time and day.
  • Next is the run time, e.g. 20mins
  • Next is the days you wish to water, e.g. all 7 days.
  • Next is the start time, you can make the program you have already set, (every day, for 20 mins) come on up to 4 times per day, hence to 4 available start times.
  • Entering 7am in start 1 and 7pm in start 2 (with start 3 & 4 set to OFF) now means you have your water come on every day at 7am and again at 7pm and run for 20mins
  • You cannot enter a start time for each day individually.

Is my timer suitable for short-run drip or micro spray irrigation?

  • Yes, although a pressure reducer placed on the tap, before the timer is recommended. If only running a few drippers or sprayers, it is not suitable. Use the CO1603.

How do I reset my timer?

  • Simply remove the battery for 5-10 mins then reinsert. Your timer will be reset to default.

Is it OK to use my timer over winter?

  • We do not recommend the use of your timer over the winter period. It will not handle low temperatures, below 3 degrees Celsius may damage the timer. We advise the timer to be removed over the winter period, or allowed to drain if left on the tap.

Can I get spare parts for my timer?

  • Yes, some parts are available for this timer. For more information, please contact us.


Preparing tap timers for winter

  • Be sure you check with your local water authorities for any sprinkler bans
  • We recommend either reducing the watering time or turning it off completely
  • In really cold climates, we suggest that you remove the battery and make sure there is no water left inside the tap timer
  • If you live in an area that gets frost, we recommend taking off the tap timer completely and storing it away for the meantime

Customer Reviews

Based on 18 reviews
McKenzie Peter (Perth, Australia)
Timier makes life Easier.

The clear instructions and the simple process to set the closck and program the timer is remarkable and is a great product to have in my garden. Thank you Holman.

Only lasted a year

Worked well but then digital display froze. Just installed new battery. Removed battery waited 2 minutes and then tried again, still frozen. Keep your receipt people.

Hi Meagan, thank you for your feedback, if you could please contact our Customer Service Team at for further troubleshooting, we may be able to resolve this issue. Thank you, Holman Team.

Peter Papadopoulos (Sydney, Australia)
Automatic Digital Tap Time

This item is easy to set up, especially with the video format instructions. Well - priced and works appropriately. Happy to recommend it for DIY irrigation projects.

Graham Wall (Cessnock, Australia)
Auto tap timer

I have blown the top of 10 of these in the last few years.
The plastic flange near the tap blows off.
I have installed a pressure reducer at theMain.
I have reduced the water flow at the tap and it still blows.
Thanks Bunnings for your return policy

Gai Runnalls (Sydney, Australia)
Stopped working

It was great at first but then the press buttons stopped working and I couldn’t adjust the settings at all. The digital readout is hard to see in sunlight. I think Holman need to redesign this unit completely. A waste of time and money after the first season.

Jose Ozorio (Townsville, Australia)

Have had three of these. Only last a bit over a year due to high mineral content in the local town water supply. The electronic works fine but the shut off valve starts leaking due to mineral build up.

B.K. (Sydney, Australia)
User friendly timer

Well set up , reliable , I have 7 watering trees on farm doing a great job.

Paul (Brisbane, Australia)
Easy set up

I have two of these units and found them easy to set up. Instructions are clear to follow and I would recommend the unit to everyone.

JOHN TWARTZ (Adelaide, Australia)
Good, then it crashed

It lasted 2 years. I replaced the battery, all good; went on a 2 month holiday. The timer burnt itself out sometime and my vegie patch was completely dead when I returned home last week. Disappointing.

Mark (Sydney, Australia)
Solid product

I have 5 controlling both front and back gardens. Great product, was easy to program. One trick I found is to program your timer before installing to your tap. Makes things a bit easier. I also have found they split if left out over winter in - temps.

Looking for support?

Download a product manual to help get you started, or find answers to your product questions with our help articles!

Intuitive Programming

  • Up to 4 start times per day
  • Individual day selection with 7 day calendar
  • Watering duration selection 1min to 12hrs 59min
  • “OFF” button to stop watering immediately or to act as a delay after rain

CO1605 Automatic Digital Tap Timer Flow Rate

Water Pressure (kPa)L/min

Intuitive Programming

  • Up to 4 start times per day
  • Individual day selection with 7 day calendar
  • Watering duration selection 1min to 12hrs 59min
  • “OFF” button to stop watering immediately or to act as a delay after rain

CO1605 Automatic Digital Tap Timer Flow Rate

Water Pressure (kPa)L/min
Automatic Digital Tap Timer

Tech Specs

  • Model Number: CO1605
  • Battery: 9V battery (not included)
  • Material: Plastic
  • Colour: Grey
  • Weight: 0.24kg
  • Dimensions: 111 × 85 × 165 mm
  • Fitting Size: 12mm
  • Fitting Type: Snap-on
  • Above Ground: Yes
  • Minimum Pressure (kPa): 100
  • Maximum Pressure (kPa): 600
Automatic Tap Timer in packaging

Packaging Contents

  • 1× CO1605 Tap Timer
  • 1× Universal Tap Adaptor
  • 1× 12mm Snap-on Connector
  • 1× User Manual