Aspire K3 Tank Replacement

Eighteen millimetres wide and 55mm tall. The Aspire K3 is a compact MTL glassomizer built around Pyrex glass, stainless steel construction, and Aspire's proven Nautilus BVC coil platform. It holds 2ml of e-liquid (TPD compliant), fills from the bottom via a twist-off base cap, and connects to any 510-threaded battery or mod. Fixed airflow through four precision-cut slots at the base keeps the draw tight and cigarette-like.

A 1.8ohm Nautilus BVC coil comes pre-installed, and the tank also accepts the 1.6ohm Nautilus BVC head. Two finishes in the store picker: Black and Silver. Removable 510 drip tip included. If you need a straightforward MTL Tank that runs on one of the most widely available coil families in UK vaping, the K3 does exactly that.

Why vapers choose the K3 Tank:

• Nautilus BVC coil compatibility means you are buying into one of the most established and widely stocked coil families in UK vaping, with replacements available almost everywhere

• Pyrex glass and stainless steel give the K3 a durability and chemical resistance that plastic clearomiser tanks simply cannot match, and it looks considerably better on a mod

• Bottom-fill design lets you twist off the base, fill, and reassemble without removing the tank from your device, which saves time during a busy day

• Fixed four-slot airflow keeps the draw consistently tight and MTL-focused without any adjustment dials to knock out of position accidentally

• 510 drip tip is removable and replaceable with any standard 510 mouthpiece if you want a different material, bore, or shape

Aspire K3 Tank Replacement Features

Pyrex Glass That Handles Everything You Pour In

The tank section is genuine Pyrex, not the polycarbonate plastic used in cheaper clearomisers. That distinction matters. Acidic e-liquids, strong menthol blends, and citrus flavours can crack and cloud plastic tanks within days. Pyrex sits there unbothered. The glass also makes it easy to check your liquid level at a glance, so you are never guessing whether the tank needs a top-up.

Four Slots, Zero Fiddling

Aspire set the airflow with four fixed slots cut into the base of the K3. No rotating rings, no dials, no tiny screws. The draw lands in a specific place: tight, restrictive, and cigarette-like. For MTL vapers who know what they want and do not need adjustability, this is a benefit rather than a limitation. One less thing to go wrong in your pocket.

The Nautilus Coil Family, Still Going

The K3 runs on Aspire's Nautilus BVC coils. These have been around for years, and that longevity is the point. You can find replacements in practically every UK vape shop, online or in person. The 1.8ohm coil that comes pre-installed runs at 3.0 to 5.0V and delivers a clean, cool MTL draw. Swap to the 1.6ohm for a slightly warmer pull with a touch more throat feel. Both use organic cotton wicking. Grab fresh Replacement Coils whenever stock runs low.

Bottom Fill Without the Detach

Twist the base off the tank, expose the fill port, pour your liquid in, twist the base back on. The tank stays attached to your device through the whole process. No unscrewing the tank from the battery. No juggling parts over a sink. Sounds minor until you have done it twenty times in a week.

A 510 Drip Tip You Can Actually Swap

The included stainless steel drip tip uses a standard 510 fitting. If stainless steel feels too cold in winter or too warm in summer, replace it with a Delrin, resin, or ceramic drip tip without any adaptor. One pull, one push.

Aspire K3 Tank Replacement Colours

Two finishes. Both use the same Pyrex glass body with different stainless steel trim.

#buttons

• Black
• Silver

How to Set Up the Aspire K3 Tank Replacement

Quick and clean. Under three minutes even the first time.

1. Unscrew the base of the K3 tank by twisting it anticlockwise. The base, coil, and tank body separate as one unit from the top cap.

2. If there is an old coil installed, unscrew it from the base. Take a fresh Nautilus BVC coil and apply three to four drops of e-liquid directly onto the cotton visible through the side wicking ports.

3. Thread the new coil into the base clockwise until it sits snug. Finger-tight only. Overtightening strips the threading.

4. Reassemble the tank body onto the base. Fill with your chosen 50/50 or higher-PG e-liquid through the gap around the central chimney, keeping liquid away from the airflow channel. Do not overfill past the glass line.

5. Leave the filled tank standing upright for six to seven minutes. The organic cotton inside the BVC coil needs that time to absorb liquid fully from the base upward through the narrow wicking channels.

6. Attach the tank to your 510 battery or mod and begin with gentle draws at low voltage. Increase gradually until you find your preferred warmth.

What's in the Aspire K3 Tank Replacement Box

• One Aspire K3 glassomiser tank with a 1.8ohm Nautilus BVC coil pre-installed. 

• One stainless steel 510 drip tip pre-fitted. 

• One filling and coil change instruction card. 

No e-liquid included. No battery or mod included. No spare coil included. You will want to pick up a five-pack of Nautilus BVC coils and a bottle of nic salt to get started.

The MTL Tank Built for Aspire's Pen Batteries and 510 Mods

The K3 was originally designed as the tank component of Aspire's K3 Quick Start Kit, paired with a pen-style battery. Sold separately here as a replacement or upgrade. It fits any device with a 510 connection and works best on batteries or mods that output between 3.0V and 5.0V. That covers most pen-style Aspire batteries, basic regulated mods, and eGo-style devices.

What it does not suit: high-wattage box mods running sub-ohm builds. The K3 is a 1.8ohm MTL tank with fixed restricted airflow. Pushing 30W or more through this tank is not what it was built for, and the coil will burn out almost immediately.

About Aspire

The K3 sits in a specific corner of Aspire's range: the compact, affordable, entry-level MTL tank. It shares its coil platform with the Nautilus family, which is one of the longest-running and most widely distributed coil systems in vaping.

Aspire built their early UK reputation on exactly this kind of product: simple, well-constructed mouth-to-lung hardware that works reliably without demanding technical knowledge from the user. The K3 carries that same design philosophy. No frills, no features you will never use. Just a well-made glass tank that does one thing properly.

Stock Up and Save

The K3 comes with one coil pre-installed and no spare. At daily MTL use, a single Nautilus BVC head lasts roughly a week, sometimes a bit longer with lighter vaping. Picking up a five-pack of replacement coils alongside the tank means you are covered for over a month without reordering.

Consider grabbing a spare piece of Replacement Glass too, because Pyrex survives drops better than plastic but it is not invincible. Every order from Pirate Vapes ships same day before 4 pm. All stock is TPD compliant, with age-verified checkout and over-18s only.

Conclusion

The Aspire K3 is a small, well-built MTL tank that runs on one of the most established coil families in UK vaping. Pyrex glass, stainless steel body, fixed restricted airflow, bottom fill, and Nautilus BVC compatibility at a price that makes replacement painless. Two colours, 510 connection, and a coil platform you can source almost anywhere.

If your K3 tank needs replacing or you want a second tank in your rotation, this is a straightforward pickup. Browse more from Aspire and check out the full Vape Accessories range at Pirate Vapes.

FAQs

What coils fit the K3 tank?

Aspire Nautilus BVC coils in 1.6ohm and 1.8ohm. The 1.8ohm comes pre-installed. Both are widely stocked across the UK.

Does the K3 work with high-VG e-liquid?

Not well. The wicking ports and fixed airflow are designed for 50/50 VG/PG or thinner. High-VG liquids above 60% VG will wick too slowly and produce dry hits.

Can I use nic salts in the K3?

Yes. The tight MTL draw and low wattage suit nic salts at 10mg to 20mg in a 50/50 ratio. Smooth throat hit, good flavour, minimal liquid consumption.

Is the K3 tank adjustable airflow?

No. Four fixed air slots. The draw is set from the factory: tight, restrictive, MTL. No adjustment ring or dial.

What battery does the K3 tank need?

Any 510-threaded battery or mod outputting between 3.0V and 5.0V. Pen-style Aspire batteries, eGo devices, and basic regulated mods all work. Not designed for high-wattage sub-ohm setups.

How often should I change the coil?

Roughly every five to ten days with daily MTL use. Sweeter e-liquids shorten coil life. When flavour drops off, or you taste a burnt note, it is time for a fresh one.