Review: The Fogger V4

As a huge fan of the Aqua RBA I couldn’t resist taking a look at Yi Loong’s newest rendition of the Fogger. Back in the early days of the Kayfun atomizer the original Fogger hit the market and it was a big hit. It certainly wasn’t the best atomizer in any category, but it was cheap and accommodated cotton wicks, so I was intrigued. I used the Fogger v1 for a few weeks, and it was far from perfect. The insulator was junk, the deck was hard to build on, and the pin was difficult to use with many of my mods. Eventually the insulator failed on me and the mod shorted and the heat shattered the glass. Foolishly I saw a Fogger v2 and and was hoping the issues were resolved, but they remained. I think I made a smart move shelving that atomizer and switching over to a Kayfun. Since then the Fogger v3 had come out without much positive press which helped me resist purchasing one. I figured this was the end of the Fogger and the Kayfun/Aqua clones came to rule the inexpensive cotton RBA world. Then came the Fogger v4 and once again I was lured in. I searched around and the fastest way for me to get one was Ebay, and $35 and 3 days later, I received mine.

Sitting pretty on the Stingray clone

Sitting pretty on the Stingray clone

First Impressions

I will admit, this RBA showed up with better attention to detail than some other atomizers I have purchased. Most notably it came in a box. I did not expect much, and that is what I got. The atomizer was packaged in a simple cardboard box along with a keychain screwdriver and some spare o-rings and screws. Since I ordered the black model I inspected the “Paint” job. This atomizer uses a PVD coating (Physical Vapor Deposition) to paint this atomizer black, and I gotta say, they did a great job. The atomizer has a very even and spotless black coating. There is a noticeable brushed finish and this stuff feels tough. I would say I received this atomizer in mint condition and there were no apparent flaws upon my initial inspection. To be a stickler for details, I did notice the rim of the (thick) glass tank is a bit coarse, but that is just me looking for something to complain about. 

The barely used Fogger v4 and its nicely brushed black finish

The barely used Fogger v4 and its nicely brushed black finish

I give it a 9/10, there was nothing wrong, but I can’t say I was surprised.

Build Quality

Build quality is always very important with atomizers. RBA’s are devices that we constantly disassemble, tweak, modify, and rebuild. By definition the build quality determines the product life of a rebuildable atomizer. One of my initial concerns is the amount of o-rings in this atomizer and their tendency to fall out of place. They managed to jam an o-ring in every connection within the atomizer. In some places like around the copper 510 pin I wish they opted for a plastic insulator, because the o-ring doesn’t seem to stay put like some other atomizers. Besides the obnoxious amount of o-rings, this atomizer has an excellent build quality. It is very heavy, I tried this on my Nemesis clone with the black aluminum tube and it was very top heavy. I think the weight of this atomizer and the glass tank might guarantee the tank will shatter on a significant drop. Since I can’t help but wonder, I decided to put the PVD coating to an abrasion test. I started with a screwdriver and scratched around the base… nothing. I moved on and grabbed my dremel. First came the cotton polishing tip which did nothing but leave a shiny spot. I then grabbed a brush tip to achieve the same result. It took the stone wheel to leave a mark on this bad boy.

The chip was created by my  grinding stone

The chip was created by my grinding stone

The build materials are very high quality. The copper 510 pin feels solid and has a nice flat top. The chamber fits together almost seamlessly. The top cap securely screws down to make a reliable seal with no leaks. I’ve heard complaints that the AFC ring tends to unwind, but I must have a second-batch unit here, because that is a non issue. The knurling on the AFC makes it very easy to grip and adjust. Much like the previous Fogger v2, the AFC ring is limited and can not fully open and remain at about 50%, but even with the air holes partially obstructed the hit is very airy. The o-ring on the fill hole broke the first time I took it out, but I replaced that with one of the spares. My biggest complaint is the size of the post screws. They are simply too narrow and make gripping a 28awg dual coil difficult. I took the suggestion of a Reddit user and assembled my coil from a single strand of kanthal to overcome the posts from “dropping” the leads when tightened down.

Dual micro coils right around my ideal .5 ohm. Notice the coil is a single strand.

Dual micro coils right around my ideal .5 ohm. Notice the coil is a single strand.

I give it a 7.5/10, the o-rings, and AFC aren’t perfect, but the posts bother me the most.


This atomizer took me a few tries to get a good vape. It does not work exactly like either the Aqua nor the Kayfun. Once I got over the difficult posts and put a wick in this atomizer my first few attempts were awful. Initially I took the Aqua approach and ran my wicks through the juice channels into the tank, and I would not recommend it. The corners of the juice channels were choking the juice flow and drying out the wick. The next attempt I went the Kayfun route and laid the wicks across the decks, but this gave me an equally bad result. I finally settled on placing a small pointed lead into the channels, but not all way through, just so they barely reached the bottom, and this made all the difference. The positive post insulator has been excellent. Usually when I dry burn my Aqua I have to take it easy so the insulator won’t melt, but that is not an issue with the Fogger. I’ve been vaping at least 15ml on the same wicks and haven’t noticed any flavor loss, it is working great.

Excellent juice flow with the wicks as shown

Excellent juice flow with the wicks as shown

The fill hole is a little difficult to deal with. The fill screw has an o-ring around it that will fall off the screw every time you fill it. It is also too narrow. I can not manage to fill the tank without an excessive amount of liquid pouring back out of the fill hole or drip tip. This atomizer requires a whole paper towel for clean up if you plan on using a dropper. On a positive note, the juice capacity is very high, it holds a questionable amount of liquid between 5 and 6ml. I tried to get a clear measurement, but the fill hole failed me and I lost track. I make a mess every time I fill this atomizer, I really wish it had a top fill option, but the unthreaded tank makes this near impossible. It is nice to have such a big tank. With the Sony VTC4 battery I simply replace the battery at each juice refill and enjoy a nice and cloudy vape all day.

I give it an 7.5/10 considering the fill and coiling difficulty


On a black mod this is a great looking atomizer. I was very excited to see which of my mods the paint job would best accommodate. I ended up settling on the Copper Stingray clone. The weight of the copper tubes helps make the mod more stable, the Nemesis was a bit top-heavy in 18650 mode.

The Fogger with a hybrid adapter on the Nemesis clone, Hybrid Aqua for scale

The Fogger with a hybrid adapter on the Nemesis clone, Hybrid Aqua for scale

I think the atomizer looks great. The drip tip that was included turned out to be rather lackluster, and I prefer a shorter drip tip so I shelved that right off the bat. The paint job was done very well and there are no spots or discoloration. No complaints here.

I give it a 9/10.

Overall Value

I would say overall value is where this mod really shines. For $35 I got one of the best atomizers I have used to date and it isn’t a clone. I wouldn’t suggest this for a first timer who is trying to get a dual coil tank atomizer, it is a little difficult and finicky on the deck. The filling can also be a slight pain, but I think I will get better with practice.

  • 22mm Diameter, slightly wider at the AFC ring
  • Dual air flow channels, plenty of flow
  • Nice rugged black PVD coating
  • Excellent adjustable copper 510 pin
  • Glass tank is nice and thick
  • The drip tip well is a very appropriate size and it doesn’t drop drip tips
  • Excellent vape, nice thick clouds
  • All day capacity of at least 5ml
  • Easy to clean
  • Compatible with hybrid adapter kits
  • The Bottom fill hole can be difficult
  • A very heavy RBA, it feels tough

This atomizer gets a 8.5/10 overall. I am very satisfied with the purchase and it works just like the extra large Aqua I hoped it would be.

I got mine off of Ebay, but there are many stores that have this atomizer in stock right now. The cheapest I’ve seen is just under $30 after coupon code “reddit10” here:


5 thoughts on “Review: The Fogger V4

  1. john

    If you want the air flow control all the way open on the fogger v4 you have to set it there before you put everything together, however you will not be able to tighten the draw up unless you loosen the tank up.
    Putting any amount of wicking material in the channels did not work for me at all, instead i just layed the cotton on the deck above the juice flow and its been working fine.
    Yes i have the black one, ebay!

  2. Michael Doktorovich

    This Fogger 4.3 is an old news. Even though it vapes good, it only holds 3 ML of liquid and the fill hole is a pain I the “A”. Yiloong is now shipping a new Revision 4.4 (V4.1 is it’s official name)The difference is that it has smaller deck and chimney that allows for more liquid (still not quite 6 ML, more like 4.5) and it is easier to fill because the deck doesn’t obstruct the fill hole anymore.
    V4.2 vs V4.3
    New Fogger V4.4
    And now Fast Tech is selling one that looks like this V4.4 but without a Copper center contact screw for $16.93. Not a bad deal, but it could be a clone, you newer know with Fast Tech.
    FastTech Fogger V4.???
    But the best version was V4.2, discontinued. You can still get it for $40.00 here:
    Here are some of my Fogger builds:
    Fogger 4.3
    Fogger 4.2
    The Big Fogger

  3. Gary

    Hey there, I’ve dropped you a note before about just how great I think your reviews are and I still think your the best in the business.
    Recently, and this is a bit off topic, but I got the Fogger 28mm from a vendor and we, just as of yesterday, after a week of back and forth words on what they sold me which I insisted was a clone, and my first suspicion was due to the fact it arrived in the usual clone box, plain white with no name and I own three 22mm Foggers that came in the genuine Yiloong packaging with the hologram seal on it and I was wondering if anyone else has been seeing these.
    This company who I’ll only name if asked directly even went so far as to get Alibaba the distributor involved and that was a huge mistake on the vendors part since I was able to talk since to them and let them know that in no way was I kidding around here and even sent them pictures of proof to include the off size thread measurements, this clone was so bad on the 510 connection you didn’t even need to thread it on it would slide straight to the bottom with very little wiggling around.
    I guess the vendor who is obviously Chinese thought another Chinese would save them, well little did they know I speak broken English very well actually…☺
    Well suddenly after I got done with Alibaba and informed them that I was fairly certain that Yiloong would not take kindly to them “maybe” distributing clones of their product as this vendor apparently is insinuating by even getting them involved, well long story short the same day the vendor sends me a message in the broken Chinese to English saying Oh we are now in possession of the newest packaging from the distributor and you may send back the one you have in hand and we will send you the newest one or refund. Just like that, never heard back from Nancy Wu at Alibaba who I know offhandedly making this vendors move probably quit a surprise when they heard that the distributor knew who I was and probably told them I don’t joke around at all especially when it comes to my money, but this really pissed me off so I guess what I’m saying is to beware if just buying, as there are clones out and they are really bad, not that the threading on any of my Foggers is the greatest in my opinion but these clones are so bad they are unusable really.
    All and I mean all of Yiloong products come in their packaging with at the last I know a hologram seal on it as they are quit proud of their products, I personally have some mixed feelings, but they work.
    Gary, that old guy who’s sort of disabled and likes to make hybrids out of clones and put them on consignment at the local B&M’s and Thanks Fatdaddy for making me look smart ..LOL

  4. Gary

    Saw mention in post by Michael about Frog in Frog, was reading through some discussions at FastTech about Fogger clones and that was one company a guy claimed to have gotten a clone from and his pics where identical to mine, plain white box and all.
    Just know what your receiving, never a white plain box..!


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