Aspire Quad-Flex 4-in-1 Kit Review

Bill takes a look at the Swiss Army knife of atomizers, the Aspire Quad-Flex Survival Kit to find out one thing and one thing only: How does it vape?

Aspire QuadFlex Variations

Aspire Quad-Flex Kit Intro

Aspire has taken its new version of the classic Nautilus mouth-to-lung tank, the Nautilus X, and, through a feat of engineering that is both clever and bizarre, transformed it into the Swiss Army Knife of atomizers: a 4-in-1 “Survival” Kit, called the Quad-Flex, that can be used to assemble a 22mm 1.8Ω Nautilus X MTL flavor tank, a cloud-chasing sub-ohm RDA (as either a standard dripper or squonker, with either top or bottom airflow), and a Genny-style sub-ohm RDTA tank.

This is either brilliant or ridiculous. I can’t decide which. To say that it’s thinking outside the box is an understatement. The Quad-Flex is so far outside that you might need a GPS unit to find the box.

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Aspire Quad-Flex Kit Specs and Features

Kit Content

  • 1 x Nautilus X top hardware
  • 1 x Nautilus X 2ml Pyrex
  • 1 x Nautilus X 1.8ohm coil
  • 1 x Nautilus X base hardware
  • 1 x RDTA tank adapter
  • 1 x Capillary screw
  • 1 x RDA Base
  • 1 x RDA Deck
  • 1 x Wide bore Delrin drip tip
  • 1 x 510 drip tip adapter
  • 1 x Top hardware with side airflow
  • 1 x Top hardware with top airflow


  • Capacity: 2 mL
  • Diameter: 22 mm
  • Resistance: 1.8Ω factory head
  • 0.4Ω dual coil
  • Thread: 510 thread
  • Material: Stainless Steel + Pyrex glass

Notable Remarks


The Quad-Flex Kit is available online for $33-50. As of the writing of this review, it’s new, so it’s available from only a few online vendors, mostly Chinese.


Aspire QuadFlex

From what I can tell, the Quad-Flex began life as a Nautilus X compact (22 mm diameter) MTL flavor tank. From there, Aspire’s designers reverse-engineered it to make possible the transformation into an RDA or a Genny-style RDTA, both of which involve swapping out the factory Nautilus X clearomizer head for a dual-post four-hole Velocity-style deck.


Aspire QuadFlex RDTA

Since the Quad-Flex actually is a Nautilus X, performance in that configuration is predictably good for MTL vapers who want maximum flavor in a low-power tank. Happily, performance is also satisfactory as either an RDA or RDTA.

That’s the good news. The bad news is that, unlike my other Genny-style RDTAs, the Quad-Flex has no fill port. To fill the tank, the top half of the tank (with the deck and the wicks hanging down into the reservoir) has to be unscrewed from the glass reservoir section on the base. Without taking care, that can be messy. In fairness, the same can be said for every fill method, but the Quad-Flex RDTA requires a bit more carefulness than some.

The big question about the Quad-Flex is: Who is this product for? Yes, it’s clever enough, but how many vapers will actually want to use it in more than one configuration? I’d guess some, but not too many. My hunch is that relatively few vapers go back and forth from direct-lung to mouth-to-lung vaping.


Atomizer performs well in every mode. As a compact Nautilus X, it was perfect.
Perfect as a compact Nautilus X
Satisfactory as an RDA or RDTA
Includes an adapter cap for standard 510 drip tips


Jigsaw-puzzle construction
Filling the RDTA is less than brilliant


Is the Aspire Quad-Flex Kit the coolest thing since sliced bread or just a failed jack of all trades but master of none? Probably neither. It’s a product for vapers who like multi-use designs. My main concern is that the number of those people might be fewer than Aspire is betting on.

I won’t give a recommendation either pro or con. If you like the idea of a Swiss-Army-knife atomizer, by all means get a Quad-Flex Kit. Just be sure that you want and need all the options.

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Bill Herbst
My name is Bill. I’ve been a dedicated vaper for five and a half years, having ended a 35-year addiction to tobacco cold-turkey on my first day of vaping. I live on the Oregon coast, in the tiny town of Florence, one huge sand dune away from the Pacific Ocean.

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