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Discussion Starter · #1 ·
I have the AQUATEK Aquarium CO2 Regulator with Integrated COOL TOUCH Solenoid. It's on a timer to turn on & off at specific times. When the timer switches off, the solenoid sticks in the open position. I have to unplug & plug it back in multiple times before the solenoid closes. I unscrewed the solenoid from the brass regulator and found that the rubber O-Ring has been torn slightly and that's the reason the solenoid wouldn't close properly. I reached out to Aquatek about a replacement O-Ring and they replied by I need to order a new solenoid. Of course they would, they want me to pay $40 for a new solenoid rather than pay less than $1 for a new O-Ring. Horrible!!!

Has anyone had this same problem and how was it rectified? I can't seem to find the exact O-ring to replace. I found one at Lowes and it's 5/16" ID x 1/16" CS, but it's too thick. The CS is half the thickness around 1/32" that I need.

The picture below is the O-ring that I'm talking about. It's NOT a picture of the torn one that I have, it's just a reference to location of O-Ring.
 

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I'm not sure if that exterior o-ring is the cause for the solenoid sticking. Try plugging and unplugging it to test. You should hear clicking sounds where the magnet fires up.
 

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Discussion Starter · #4 ·
The O-Ring had a little torn piece hanging off and looks like it was jamming the piston from moving. I found new O-rings which are 8mmx10mmx1mm and waiting for delivery. I also lubricated the piston with a drop of WD40 and for the past 3 days seems to be working fine now.
 

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The O-Ring had a little torn piece hanging off and looks like it was jamming the piston from moving. I found new O-rings which are 8mmx10mmx1mm and waiting for delivery. I also lubricated the piston with a drop of WD40 and for the past 3 days seems to be working fine now.
WD40 isn't really a lubricant. The "WD" stands for "water displacing". It's a solvent and a rust dissolver and will do more to dry things out. You'd be better off using a silicone or Teflon lubricant.
 

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I replaced my Milwaukee regulator that I had for 15 years with the Aquatek Basic. I chose the basic because I don’t want to have to play around with the working pressure. This regulator is great quality and is only a little more expensive than some of the bargain regulators that look suspect to me. I have only been using mine for a couple of months but I haven’t had any issues with it yet, which is a good sign that it is indeed durable.
 
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