Galcon Alternator Valve

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  • Theresa Lam - Jul 18th 2022

    Galcon Alternator Valve

    It would be great if it lasted more than 2 seasons. I won't spend money on it again. Products at this price should last longer.

  • Lisa Fritz - May 30th 2022

    Great product

    I just tested my irrigation system for the season and found my Galcon alternator is no longer working, so I came to Dripworks to order a replacement. The original one lasted more than 12 years. I'm happy with that product lifespan. I'm in Tennessee, so I haven't had problems from freezing.

  • james young - May 24th 2022

    alternator valve

    second time i have to replace this valve, and the replacement is made different from the last.

  • Jason - May 20th 2022

    Great product

    Great overall valve. Only complaint is there should be a way to drain the bowl so that a small amount of water won't freeze and crack it.

  • Bill F - May 16th 2022

    Works great until it doesnt

    Really good gadget except that the elastic diaphragm that actuates the valve doesnt seem to last more than one season, and then i have to buy a whole new unit. If they sold the diaphragms separately as repair parts it would get a 5 star review.

  • Nelson - Jun 15th 2020

    Galcon Alternator

    The Galcon alternator is good....when it works. I shop with Dripworks all the time and love everything they sell. However, if I am going to be honest, I have had to replace the alternator once a year for the past 4 years as it breaks or does not work after a years time.

  • Susan - Apr 25th 2020

    I love this thing! 5 stars!

    I have a large garden that is divided in quadrants. Paired with a timer, it is easy to irrigate one side and then the other without lifting a finger.

  • Nancy - May 15th 2019

    Very useful item

    I love the function of this alternator valve -- it allows a single outlet timer to alternate sending water to one system on one cycle and another system on the next cycle. You can also manually switch it if you just want to test it. I had a little trouble when one blew apart, but Dripworks replaced it right away. It may have been cracked in assembly, but the others I have continue working just fine. The literature says it can handle up to 120 psi, but a pressure regulator may be a good idea. I love that it's simple, operates on water flow alone, and effectively turns a single outlet timer into a dual outlet timer. I have the timers set to water one system one day and another the next, but you could program your timer to water both systems in the same day just by having it operate twice a day.

  • Colorlicious Landscaping - Aug 25th 2017

    Galcon Alternator Valve

    It works great and best part is that it runs on water pressure and does not reduce pressure much at all. Downside is overtime it starts to leak and I am not sure if the valve closes completely as I am now getting constant leaking from it down the line. So I had to get a replacement valve after about 2 yrs

  • John Blackwell - Mar 6th 2014

    Alternator Valve

    Most game changing item in my garden. Works every time. Gives me ultimate flexibility to run water under pressure further. Saves water under California drought conditions.


Don't buy another expensive timer or build a complex manifold! Simply attach our hose threaded Galcon Alternator Valve to your spigot or timer to instantly double coverage of your drip irrigation system.


  • Outlet switches with each timer cycle
  • Rugged, impact-resistant construction
  • Ideal for remote applications
  • Female hose thread inlet and male hose threat outlets

This Alternator Valve is not a timer, and does not require batteries or a power source. It is simply powered by the water moving through it. Place the Alternator Valve downstream of a timer or valve and it will alternate the water flow from one outlet to the next with each timer cycle. It is a simple, inexpensive solution to double the coverage of your drip irrigation system.


  • Allows flows up to 6 gallons per minute per outlet
  • Operates in a pressure range from 14 to 140 PSI
  • Low friction polymer construction
  • Flow switches from outlet 1 to outlet 2 with each timer cycle
  • Allow one minute of "recovery" time between timer cycles

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