K2 Vape Tank By Aspire

Fifteen millimetres wide. That is all. The Aspire K2 is one of the slimmest MTL Tanks still in production, and it does exactly one thing: deliver a tight, cigarette-style draw from a 1.8ml pyrex glass tank with a pre-installed 1.6ohm BVC Kanthal coil. Stainless steel body, fixed bottom airflow, bottom-fill design, and a standard 510 thread that connects to practically any pen-style battery or low-wattage mod.

Aspire built this as the successor to the K1, doubling the airflow inlets from two to four for a smoother pull. Two colours in stock at Pirate Vapes: Black and Silver. Over 18s only.

Why vapers choose the K2 Tank:

• At 15mm diameter, it pairs with eGo-style batteries without looking like a science project strapped to a pen. The proportions match slim pen devices in a way that wider tanks never quite manage, and the weight stays low enough to forget it is there.

• Fixed airflow means consistency. No accidental setting changes in your pocket, no loose airflow rings. Same draw every time.

• Pyrex glass handles aggressive e-liquids that would stain or crack polycarbonate tanks within a couple of weeks. Menthol, cinnamon, citrus: no clouding.

• Bottom fill is slower than side fill, but it seals properly. The K2 does not leak.

• BVC coil compatibility keeps replacement costs low since Aspire's BVC clearomiser coils are widely available and sold in five-packs.

K2 Vape Tank By Aspire Features

Still Thinner Than Almost Everything Else

At 15mm across, the K2 matches the diameter of a ballpoint pen cap. That is not a novelty stat. Pen-style batteries are designed around this width, and when the tank matches the battery, the whole device looks and feels intentional rather than top-heavy. If you carry a vape in your shirt pocket or handbag, the slim profile genuinely matters. Wider tanks on narrow batteries look awkward and feel unstable.

Four Air Inlets Where the K1 Had Two

Aspire doubled the bottom airflow inlets from the K1 to the K2. The draw is still tight and firmly MTL, but the extra airflow makes it smoother. Less resistance on the inhale, less effort per draw. Not a massive change on paper, but noticeable after a few tanks. Fair enough improvement for what is essentially the same tank platform.

That Pyrex Earns Its Place

The acid-resistant Pyrex glass section is not a marketing line. Polycarbonate and PMMA tanks react with certain e-liquid compounds, particularly cinnamaldehyde (cinnamon flavours), citral (citrus), and menthol. The reaction clouds the tank, weakens the plastic, and eventually cracks it. Pyrex ignores all of that. If you vape menthol e-liquids or anything citrus-forward, glass is the only sensible tank material.

Bottom Fill With a Proper Seal

Unscrew the base, fill around the centre tube, screw it back. Not as fast as a side-fill port, true. But bottom-fill tanks with threaded bases tend to seal more reliably than silicone-plug side fills, and the K2 has a solid reputation for staying dry. No leaking from the base, no weeping around the airflow. Practically speaking? Worth the extra five seconds.

Delrin Drip Tip Keeps the Temperature Down

The 510 Delrin drip tip insulates heat from the stainless steel body. Metal drip tips get uncomfortably warm during chain vaping. Delrin stays cool. The 510 fitting also means you can swap it for any standard 510 drip tip if you prefer a different shape or bore. Browse the Drip Tips and Mouthpieces collection for alternatives.

K2 Vape Tank By Aspire Colours

Two finishes. Both use the same stainless steel and pyrex construction.

#buttons

• Black
• Silver

How to Set Up the K2 Vape Tank By Aspire

Simple bottom-fill process. Takes a couple of minutes the first time.

1. Unscrew the base of the K2 from the glass tank body. The pre-installed 1.6ohm BVC coil stays attached to the base.

2. Put three to four drops of e-liquid directly onto the exposed cotton visible through the coil's wicking slots. Rotate the coil and hit each port so the cotton absorbs evenly from all sides.

3. Reassemble the base onto the glass tank. Hold the tank upside down and pour e-liquid carefully into the gap between the glass and the centre tube. Do not pour liquid down the centre tube. Fill to just below the top rim.

4. Flip the tank right side up and screw it onto your battery or mod via the 510 connection. Finger-tight only.

5. Leave it standing upright for six to seven minutes. The BVC coil uses organic cotton that needs time to saturate fully from the base upward. Rushing this step chars the cotton and kills the coil before you get a single proper draw.

6. Take two gentle primer puffs without pressing the fire button to help draw liquid into the wick. Then start vaping at low voltage between 3.0V and 3.7V and adjust upward gradually.

What's in the K2 Vape Tank By Aspire Box

• One Aspire K2 tank with a 1.6ohm BVC Kanthal coil already installed and ready to fill. 

• One replaceable 510 Delrin drip tip fitted to the top. 

• One filling and coil change guide.

No e-liquid included. No battery. No spare coils. The K2 is the tank only, so you will need a compatible battery or mod and your choice of e-liquid to start vaping. Replacement BVC coils are sold separately in packs of five.

The Slim MTL Tank for Pen Batteries and Low-Wattage Mods

The K2 connects via a standard 510 thread, which means it fits virtually any device with a 510 connection. Practically, it is designed for eGo-style pen batteries and low-wattage regulated mods running between 3.0V and 4.2V. That covers most basic vape pens and smaller box mods operating under 15W.

What it does not suit: high-wattage sub-ohm mods, temperature-control devices running at 30W or above, or DTL setups. The 1.6ohm coil is built for low power. Pushing high wattage through it burns the cotton instantly. If you want DTL vaping, the Aspire Range has tanks built for that purpose.

E-liquid pairing matters too. The K2 works best with 50/50 VG/PG blends or higher-PG liquids. Thick high-VG juice will not wick properly through the narrow BVC coil ports. Stick with 50/50 Nic Salts at 10mg or 20mg for the best MTL experience, or 50/50 freebase at 6mg to 18mg.

About Aspire

The K2 represents Aspire's approach to entry-level hardware: keep the engineering honest and the price low. The original K1 tank was one of the most widely recommended starter tanks in UK vape shops during its run, and the K2 refined it with improved airflow and the same BVC coil platform that Aspire built its early reputation on. 

The BVC system was a genuine innovation when it launched. Vertical coil orientation fed liquid more evenly than the horizontal designs that preceded it, and that engineering still holds up in the K2. Aspire has moved on to pod systems and mesh coils in their newer lines, but the K2 remains in production because there is still a customer who wants a simple glass tank on a pen battery. That is not nostalgia. That is a product doing its job.

Stock Up and Save

The coil in the box will last you a week or two depending on how heavily you vape. After that, you need replacements. Picking up a five-pack of BVC coils alongside the tank means you are covered for well over a month without reordering. If the pyrex ever takes a knock, Replacement Glass is available separately too.

Every order from Pirate Vapes ships the same day before 4 pm. TPD-compliant stock, age-verified checkout, over-18s only. Spend over £25 and delivery is on us with Free Pirate Post.

Conclusion

The Aspire K2 is a slim, no-nonsense MTL clearomiser tank for vapers who want a simple glass-and-steel setup on a pen-style battery. No adjustable airflow, no wattage modes, no complexity. Just a 1.8ml pyrex tank, a 1.6ohm BVC coil, fixed bottom airflow, and a reliable bottom-fill system that does not leak.

It is not trying to be anything more than that, and it does not need to be. If your setup is a pen battery and a bottle of 50/50, the K2 delivers. Browse more vape accessories and the full Aspire range at Pirate Vapes.

FAQs

What coils does the K2 tank use?

Aspire BVC (Bottom Vertical Coil) clearomiser coils. The 1.6ohm version comes pre-installed. You can also use the 1.2ohm and 1.8ohm BVC coils for a slightly different draw. Sold in packs of five.

What e-liquid works best in the K2?

50/50 VG/PG or higher-PG blends. The wicking ports are narrow and the wattage is low, so thick high-VG juice will cause dry hits. Nic salts at 10mg or 20mg in 50/50 are ideal for this tank.

Does the K2 tank fit my device?

If your device has a 510 thread and runs between 3.0V and 4.2V, yes. The K2 is designed for eGo-style pen batteries and low-wattage mods. It will physically connect to higher-powered mods, but running it above 4.2V will burn the coil.

Is the K2 the same as the K1?

Similar platform, but the K2 has four bottom airflow inlets instead of two. The draw is smoother as a result. Both use the same BVC coils and share the same 1.8ml capacity and 510 thread.

Does the K2 leak?

No. The bottom-fill, threaded-base design seals tightly. The fixed airflow also eliminates the loose airflow ring that causes leaking on adjustable tanks. As long as you do not overfill past the top of the glass, the K2 stays dry.

Can I use the K2 for sub-ohm vaping?

Not even slightly. The 1.6ohm coil is built for mouth-to-lung draws between 3.0V and 4.2V. Sub-ohm wattages will destroy the coil immediately.