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Part# AN4062-1
MFR Model# AN4062-1


These plugs are used to prevent rust and corrosion in engines while in storage. Contain silica gel which turns from blue to pink when moisture is absorbed. Reusable and refillable. The pink silica gel may be reactivated (after removing from reservoir) by heating for 16 hours at 250F.

DISCOUNT: LESS 10% ON 25, 15% ON 50, 20% ON 100.

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Two comments on these Dehydrator Plugs, and I see by the others submitted that everyone else has experienced the same problems. 1. Arrived already pink. 2. The threads are absolutely terrible. I could only get about 1/2 to 3/4 of a turn on each plug. I didnt have an 18mm die to chase the threads so I wasted way too much time messing with a jewelers file on each one before they would fit. And yes, my regular Champions will screw in by hand all the way to the copper gasket, so its not a case of dirty threads. Absolutely no quality control on these very marginal items two stars are generous. Richard B.

Richard E
August 27, 2019

I like using these if Im doing maintenance on my airplane that might take several weeks to complete. The plugs are easy to regenerate at low temp in a toaster oven (I remove the silica gel to regenerate and then pour it back in when done). The units do not thread in very well, though - even on a new cylinder. Seems like I might get one thread or so engaged, but that is good enough to work well (doesnt seem to have a significant leak that causes fast deterioration of the desiccant.

July 19, 2019

fragile. hard to thread in and out. use at your own risk!

Peter R
June 11, 2019

The dehydrators arrived in individual small plastics bags. The silica had all turned pink, ie, moisture saturated. Sent complaint email to Spruce - got no response. Threads are not quite right - unable to get but 2-3 turns of plugs into cylinders.

Mike G
May 23, 2019

Just what I needed for the time between installing the exhaust on my experimental aircraft and first engine start. Gives some peace of mind as the clock ticks.

Mark E
February 28, 2019

Plugs work fairly well, only they dont screw in as easy as they should. I had mine in my engine for a year, and the silica slowly turned pink showing they were absorbing water vapor. It only took one hour in the oven to bring back the dark blue color....ready for use again. They are kind of fragile...handle with care.

Forrest M
November 8, 2018

I have to agree with the negative reviews here: Ive broken two of them already by brushing or bumping against them while working on the engine. They shatter and silica goes everywhere. I also moved them all to the lower plugs because I was worried about them breaking and most of them fill with oil on the bottom. The rubber seals that holds the sintered screens in place tend to be loose and undersized so that when you take them apart to change the gel, the screens are hard to keep in place. Again, I can see the screen failing to do its job and gel falling into the cylinder. Going to replace these with Mil Spec plastic assemblies.

Bruce Z
October 16, 2018

While this product does its job, it is so fragile that risk of breakage is unreasonable. Changing the dessicant requires removal of the plug, which is made of plastic. The glass globe which contains the dessicant is held on by a flimsy clip, over which you have to set a plug socket wrench to install or remove. So far, Ive broken off one base in the cylinder head, and broken one globe. At the very least, the globe needs to be made from shatter resistant plastic. The retaining clip mechanism needs to be re-designed, and the threaded base should be made from metal.

James M
July 9, 2018

Received with crystals already pink. Item on backorder for several weeks.

June 4, 2018

John R
March 8, 2018


Q: Do the dehydrator plugs come with silica gel/desiccant or do you have to buy it separately?

The AN4062-1 Dehydrator plugs come with the silica gel / desiccant. It is sold separately in case customers need more gel but already have the plugs.

Q: What size are the threads for the dehydrator plugs?

The thread size is 18mm threads.

Q: Do you have 14 mm dehydrator plugs?

No. We do not stock 14MM dehydrator plugs, but if you let our sales staff know how many you need, we can try to special order them for you.

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