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 13 reviews
J.O. (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 Summerell (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.

Graeme Stewart (Melbourne, Australia)
A Solution for a Difficult Access Garden Bed

I purchased two automatic digital timers to set up watering whilst on holidays. The holiday didn't happen due to Covid in the family but I have used one timer in an area where the tap is behind hedges. It is set to water once a week for 40 minutes and is working excellent. I had to get advice from Holman as to how to set the duration to less than an hour. Once that advice was received it was easy to set up, although you must read the instructions carefully and follow them exactly. I've suggested the instructions be amended to explain you must set the minutes on duration to a number before you can set the hour to zero. An excellent piece of equipment that is great value. I'll use the other unit when we next go on holidays.

D.M. (Adelaide, Australia)
Excellent Timer

Been using this timer for a few weeks now without any issues at all. Very easy to set up and use. Previously been using dearer timers, (other brands), that have been a complete waste. I fully recommend this timer.

David Booth (Melbourne, Australia)
Great little timer

Have been using timer for a few months and is so easy and hasn't
missed a beat. All controls are logical and uncomplicated.
Would recommend it as a simple weekly timer,is easy to override
to turn off or adding extra watering.

Barry Priest (Melbourne, Australia)
Great for automatic watering of garden when on holiday

I have just returned from a weeks holiday after leaving my recently planted vegetable garden in the care of the Holman Digital Tap Timer. The timer was set to commence watering every second day at 7.00am for a 30 minute duration. The Timer was connected to a garden hose and sprinkler and the whole system was tested prior to leaving home.
There were some very hot days during the week that I was away but I was very pleased with the condition of the plants when I arrived back home.
The Tap Timer is easy to setup, has many options and can be bypassed with the press of a button if extra watering is required between start times. I love this timer.

Toni (Richmond, Australia)
Great product

Great product and reasonably priced. I used this one as it give a longer time frame than the smaller timer. Would like to see a 2 hose outlet available.

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