What Is Nexa Juicy Lock and Crystal Tank?

Nexa Juicy Lock keeps juice sealed until you activate it, and it teams up with a see-through Crystal Tank.

You will find both features on the Pix 35K and the Ultra II 50K.

Together, they change how a disposable stores its juice.

In this guide, we explain what each feature does, how to activate it and how to read the tank.

We are an independent retailer, so we quote the brand where it matters.

Then we add practical advice from the shop floor.

The Problem These Features Solve

Most disposables share the same basic layout.

A cotton pad soaks up e-liquid at the factory and feeds the coil.

That design works, but it has two weak spots.

First, the juice sits in cotton for weeks or months before you buy it.

Over time, that long soak can dull the flavor. As a result, your first puff may already taste tired.

Second, a fully soaked reservoir has more chances to leak. Heat, pressure and rough handling all make it worse.

Then there is the guessing game.

With an opaque body, you rarely know how much juice remains until hits turn dry.

The brand designed two answers. One keeps the juice sealed, while the other makes it visible.

How Nexa Juicy Lock Works

On its technology page, the brand calls this feature a sealed e-liquid delivery system.

It lists three design points: an independent tank, a pre-locked design and an all-around liquid delivery system.

In plain terms, the main e-liquid supply stays sealed away from the wick until you activate the device.

Activation takes one press. You push the tank and body together, they click, and the seal opens.

After that, the system delivers e-liquid to the coil on demand.

So the wick draws fresh juice as you vape.

The brand sums it up with the tagline “Vape Fresh, Press To Go.”

Similarly, the Ultra II page uses “Fresher Taste, Press to Go.”

What a Sealed Reservoir Changes

• Fresher flavor, because the bulk of the juice stays sealed until you open it.
• More consistent taste, since the brand says the sealed design keeps flavor steady.
• Better leak resistance before activation, because the juice cannot reach the wick early.
• Easier stocking up, since sealed devices wait patiently in a drawer.

We would add one practical note. Even a sealed device still benefits from upright storage away from heat.

How the Crystal Tank Works

The Crystal Tank is the visible half of the pair.

It is a transparent section that holds most of the e-liquid.

Its tagline is “Vape To The Very Last Puff.”

The brand also lists precise liquid capacity, a transparent tank and minimal residue.

The first benefit is obvious. You can see your juice level at any moment, so the end never surprises you.

The second benefit is less visible.

A tank built for minimal residue aims to leave less juice stranded at the bottom.

That means more of the e-liquid you paid for actually reaches the coil.

The brand also says its transparent-tank products sold several million units in the first generation.

That is its own claim, not ours.

Cotton Reserve Plus Tank

Neither device relies on the tank alone. Each one pairs a small cotton reserve with a larger Crystal Tank.

• The Pix holds 16 mL in total: 5 mL of storage cotton plus an 11 mL Crystal Tank.
• The Ultra II holds 20 mL in total: 4 mL of storage cotton plus a 16 mL Crystal Tank.

Keep that split in mind when you read the window.

The tank shows its own level, while the cotton reserve stays hidden.

So an empty-looking tank does not always mean an empty device.

A few more sessions may remain in the cotton.

Juicy Lock Technology Device by Device

Not every model in the range uses both features. This table shows what our spec sheet lists for each device.

Device	Sealed reservoir	Visible tank	E-liquid	Our price
Pix 35K	Juicy Lock	11 mL Crystal Tank	16 mL	$14.49
Ultra II 50K	Juicy Lock	16 mL Crystal Tank	20 mL	$18.99
Ultra 50K	Clarilock with Flavor Booster	Crystal Tank	20 mL	$13.49
Ultra InvisaCloud	Not listed in our specs	Crystal Tank	20 mL	$13.49
Flex Visible Pod	Not listed in our specs	See-through pod	18 mL	$11.49

The brand calls the Pix the first disposable with both Crystal Tank and Juicy Lock.

Then the Ultra II followed in October 2025.

Meanwhile, the original Ultra uses a different structure called Clarilock. It pairs a Crystal Tank with a Flavor Booster system.

See how the two Ultra models differ in our Ultra vs Ultra II comparison.

Sealed Reservoir vs Traditional Disposables

It helps to compare the two designs side by side.

Here is how a sealed system differs from a standard cotton-only disposable.

• Storage: a standard device soaks its cotton at the factory, while a sealed one keeps most juice apart.
• Freshness: sealed juice waits untouched, so flavor has less time to fade.
• Visibility: an opaque body hides your level, whereas a Crystal Tank shows it.
• Waste: a tank built for minimal residue aims to leave less juice behind.
• Setup: a standard device works straight from the box, but a sealed one needs a single press first.

That last point is the only real trade-off. One extra step at the start buys you fresher flavor later.

Clarilock vs Juicy Lock

Shoppers often confuse these two names. They come from the same brand, but they describe different designs.

Clarilock belongs to the original Ultra 50K, which debuted in October 2024.

It pairs a Crystal Tank with a Flavor Booster system.

That device holds 20 mL as a 5 mL prefilled pod plus a 15 mL container.

You attach the container by following the manual.

By contrast, Juicy Lock arrives on the Pix and Ultra II.

It keeps the main supply sealed until one firm press opens it.

Both approaches use a visible tank. However, only the newer system uses the press-to-go seal.

If you already love the original, see the Ultra 50K range, which offers 23 flavors.

How to Activate Your Device

Activation differs slightly between the two models. So follow the steps for the device in your hand.

Activating the Pix

1. First, unbox the device and remove any protective plugs.
2. Next, snap the tank into the body until it clicks and starts Juicy Lock.
3. Then slide the airflow switch to set a tight or loose draw.
4. After that, pick Normal mode or Turbo mode.
5. Inhale to vape, since there are no buttons to press.

Our full Pix activation guide covers common hiccups.

Activating the Ultra II

1. First, unbox the device and peel off any protective stickers.
2. Next, remove the silicone plugs from the mouthpiece and tank.
3. Then press the tank and body together until they click and start Juicy Lock.
4. After that, wait about a minute so the wick can soak up e-liquid.
5. Choose Normal mode for more puffs or Turbo for a stronger hit.

Our Ultra II user guide walks through each step in detail.

Why the Click Matters

The click tells you the seal has opened. Without it, the main supply stays locked away from the wick.

So if a new device gives little or no vapor, press the two parts together again.

Push firmly until you hear or feel it.

We have not seen any published way to re-seal a device after activation.

So activate it only when you plan to use it.

Reading the Crystal Tank Like a Pro

A visible tank only helps if you read it well. These habits make the window far more useful.

• Hold the device upright before you check, so the liquid settles evenly.
• Check at the same time each week to learn your own usage rate.
• Remember the hidden cotton reserve, which adds a little life after the tank looks low.
• Order a backup when the tank drops to about a quarter.
• Watch for flavor changes, because fading taste often arrives before the very end.

Over a few weeks, the tank becomes a simple fuel gauge. Then you never run dry at a bad moment.

Turning Tank Levels Into Days

Here is a simple method. Note the tank level on day one, then again a week later.

Next, divide the remaining level by the weekly drop. That gives a rough number of weeks left.

For example, if the tank drops by a quarter each week, a full tank lasts about four weeks.

Turbo mode speeds that up, because it trades puff count for a stronger hit.

Caring for the Crystal Tank

A clear tank only helps while you can see through it. So treat the window with a little care.

• Avoid dropping the device on hard floors, since impacts can mark the shell.
• Wipe the window with a soft, dry cloth when it looks smudged.
• Add a silicone sleeve for extra grip and protection.
• Clip on a lanyard so the device stays off the ground.

Flavor Freshness and Juicy Lock

Freshness is the main reason this system exists. So which flavors benefit most?

In our view, delicate profiles gain the most from a sealed reservoir. Think coffee, latte and soft fruit.

On the Pix, that includes Coffee, Velvet Latte and Peach Dive.

On the Ultra II, try Black Cherry or Strawberry Colada.

Bold icy flavors work well too. Miami Mint and Blueberry Slush are popular picks.

Browse every option in our flavor guide or our best flavors list.

Who Benefits Most From Juicy Lock

Every adult vaper gets something from a sealed reservoir. Still, some users gain more than others.

• Occasional vapers, because a device may sit unopened for weeks before its turn.
• Bulk buyers, since multi-packs stay sealed until you need them.
• Travelers, who face heat and pressure changes in bags and cars.
• Flavor fans, especially those who prefer delicate coffee or fruit profiles.
• Planners, who like to see exactly when to reorder.

On the other hand, someone who opens and finishes one device at a time may notice the difference less.

Even then, the Crystal Tank still pays off. Seeing your level beats guessing every time.

Stocking Up on Juicy Lock Devices

Because the reservoir stays sealed until activation, these devices suit buying in bulk.

A sealed device sitting in a drawer should taste just as fresh as the day it arrived.

That makes multi-packs a smart move for regular users. For example, the Pix 5-Pack costs $66.99.

Meanwhile, the Ultra II 5-Pack costs $87.49, or about $17.50 per device.

If you like variety, the Pix Slush Sampler and the Ultra II Ice Sampler mix flavors in one order.

Still, store your stash upright, away from heat and out of reach of children and pets.

Troubleshooting Juicy Lock and Crystal Tank Issues

Most problems with these devices come down to activation, timing or storage. Try these fixes first.

• No vapor on a new device? Press the tank and body together until they click.
• Burnt or dry first puffs? Wait about a minute after activation, then start with gentle draws.
• Tank looks empty but hits continue? The hidden cotton reserve is still feeding the coil.
• Small leak after activation? Store the device upright and keep it out of hot cars.
• Weak hits with a full tank? Charge the battery through the USB-C port.

For more fixes, read our not-hitting guide and our charging guide.

Myths About the Crystal Tank

• Myth: a sealed tank means you can refill it. In fact, both devices come prefilled with no refill method.
• Myth: the tank shows every drop. Actually, the cotton reserve stays out of view.
• Myth: activation happens automatically. Instead, you must press the parts together until they click.
• Myth: sealing changes nicotine strength. Every device still uses 5% (50 mg/mL) salt nicotine.

Our nicotine strength guide explains what 5% salt nicotine means.

Pix or Ultra II: Picking Your Crystal Tank

Both devices share the same core idea. Still, they suit different vapers.

The Pix is the compact option.

It measures 2.07 x 0.98 x 3.46 inches and adds adjustable airflow.

It also rates up to 35,000 puffs and runs on an 800 mAh battery.

At $14.49, it costs less up front.

The Ultra II is the capacity option. It rates up to 50,000 puffs and carries a 900 mAh battery.

It also adds a 3D curved display with dark mode. A three-second press and hold switches it on.

So pick the Pix for size and draw control, or the Ultra II for capacity and screen features.

Our Ultra II vs Pix comparison lays out every spec.

Is It Worth Choosing a Device With Both?

For most adult vapers, we think so. The pairing fixes two everyday frustrations at once.

First, the sealed reservoir protects flavor while the device waits on a shelf. Second, the window ends the guessing.

The awards back this up. The Ultra II won Best Disposable Vape at the Vaping360 Awards 2025.

Meanwhile, the Pix won Product of the Decade at the 2025 Vapouround Global Awards.

See every honor on our awards page, or read our Pix breakdown and Ultra II breakdown.

Before you buy anywhere, confirm authenticity on the official verification page.

A Quick Timeline

The visible-tank idea did not appear overnight. Here is how it reached the devices we sell today.

• October 2024: the original Ultra 50K debuts with its Clarilock structure.
• June 2025: the Pix, the first disposable with both features, wins Product of the Decade.
• October 2025: the Ultra II launches with a larger 16 mL Crystal Tank.
• February 2026: Vaping360 announces its 2025 results, with the Ultra II as Best Disposable Vape.

Frequently Asked Questions

Which devices use Nexa Juicy Lock?

Our spec sheet lists it on the Pix 35K and the Ultra II 50K. Both also include a Crystal Tank.

How do I know the seal has opened?

You will feel or hear a click when the tank and body lock together.

After that, the device can draw e-liquid.

Does the Crystal Tank show all of the e-liquid?

No. It shows the tank level, while a small cotton reserve stays hidden inside.

Will a sealed device leak?

The seal keeps e-liquid away from the wick until activation.

Also, storing it upright and away from heat helps prevent leaks.

How should I store spare devices?

Keep them upright, away from heat and out of reach of children and pets.

Do Juicy Lock devices need charging?

Yes. The Pix runs on an 800 mAh battery, while the Ultra II uses 900 mAh.

Both charge through a USB-C port, so any standard USB-C cable works.

Shop Devices With Both Features

Ready to try Nexa Juicy Lock for yourself? Start with the Pix collection or the Ultra II collection.

Not sure which fits you? Our Ultra II vs Pix guide breaks down the choice.

We ship only to adults 21 and over. Every order includes an age check at checkout and plain, discreet packaging.

WARNING: This product contains nicotine. Nicotine is an addictive chemical.