GRAV Large Gravitron – All-Glass Gravity Bong, 19mm

The GRAV Large Gravitron is the original all-glass gravity bong — the first one ever made, released in 2004, and the product the GRAV name comes from. A glass bottle sits inside a glass base filled with water. You light the bowl and lift the bottle, and the vacuum created behind it pulls smoke in until the bottle is full. Remove the bowl, put your mouth to the neck, push the bottle back down, and the pressure delivers the whole volume in one dense hit. The GRAV Large Gravitron is built from 5mm borosilicate with a 19mm female joint and ships with a 19mm Funnel Bowl.

⚡ At-a-Glance Decision Summary

• What it is: An all-glass gravity bong — a bottle and a water-filled base, no percolator and no downstem.
• Why choose it: Gravity does the drawing. There is no pull required, and the hit arrives pressurised rather than inhaled.
• The differentiator: It is a closed system. Smoke stays trapped in the bottle until you take it, so nothing burns off into the room. This is the most efficient way GRAV make to use flower.
• Joint: 19mm female — the only 19mm piece in stock at Angies Boutique, and the GRAV 19mm Cup Bowl finally has a host.
• Included: A GRAV 19mm Funnel Bowl.
• Build: 5mm borosilicate, five times thicker than the original. GRAV's own word for it is "chonky."
• Grip: A flange at the top of the neck, and a platinum-cured silicone grommet where the bottle meets the base.
• Confidence signal: Priced at $99.99, matching GRAV exactly. 115 reviews on GRAV's own site, on a design that has been in production since 2004.

Summary: The GRAV Large Gravitron is an all-glass gravity bong with a 19mm joint, 5mm walls, and a closed system that wastes no smoke.

🧠 Our Verdict

Buy the GRAV Large Gravitron if you want the biggest hit available from a piece of glass without pulling for it — gravity does the work, and the closed bottle means none of the smoke you paid for escapes into the room.

Quick Summary

The GRAV Large Gravitron is an all-glass gravity bong: a 5mm borosilicate bottle that lifts inside a water-filled glass base. Lighting the bowl while raising the bottle fills it with smoke, and lowering the bottle forces that smoke out under pressure in a single dense hit. Because the system is closed, no smoke is lost. The GRAV Large Gravitron uses a 19mm female joint, ships with a 19mm Funnel Bowl, and carries a platinum-cured silicone grommet at the base and a lifting flange at the neck. Price: $99.99.

GRAV Large Gravitron – The Original Glass Gravity Bong

Gravity bongs used to mean a cut-up soda bottle in a bucket. In 2004 GRAV made the first one entirely out of glass, called it the Gravitron, and built a company around it — the name GRAV comes from this product. Two decades later it is still in production, still the reference design, and still doing something no conventional bong does.

Here is the mechanism. A glass bottle sits inside a glass base holding water. You pack the bowl at the neck, light it, and lift the bottle. The rising bottle creates a vacuum behind it, and that vacuum pulls air through the bowl — so the flower burns without you drawing on anything. The bottle fills with smoke as it rises. Then you pull the bowl out, put your mouth over the open neck, and push the bottle back down. The descending bottle pressurises the smoke and delivers all of it at once. You are not inhaling so much as receiving. The wider GRAV range lives in our GRAV collection.

The part people underestimate is the efficiency. On a normal bong, the flower keeps burning between your pulls and that smoke goes into the room. The GRAV Large Gravitron is a closed system — every bit of smoke the bowl produces is captured in the bottle and stays there until you take it. Nothing is wasted, which is why GRAV describe it as a bud-saver and why it costs less per session to run than its size suggests.

This is version 2.0 of the design. The glass is now 5mm borosilicate, five times thicker than the original, and it feels it in the hand. A platinum-cured silicone grommet sits where the bottle meets the base, protecting both surfaces from the repeated glass-on-glass contact that killed earlier gravity bongs. A flange around the top of the neck gives you something positive to grip when lifting, which matters when your other hand is holding a lighter.

Summary: The GRAV Large Gravitron uses gravity and pressure instead of lung power, in a closed system that captures every bit of smoke.

⭐ Who This Product Is For / Not For

Ideal for:

• Anyone who wants the biggest possible hit. A full bottle delivered under pressure is more than any hand pipe or mid-size bong produces.
• People who cannot pull hard. The GRAV Large Gravitron requires no draw at all — gravity fills the bottle for you.
• Conserving flower. The closed system means nothing burns off into the air between pulls.
• Groups and parties. This is a spectacle as much as a smoking device, and one bottle serves a room.
• Anyone who owns 19mm bowls. This is the only 19mm piece in stock at Angies Boutique.
• People who hate cleaning percs. Straight glass sides, no perc, no downstem, no slots. It is the easiest shape in the catalogue to clean.

Not recommended for:

• Beginners and low tolerances. A full Gravitron bottle is a very large dose delivered at once. Pack a small bowl the first few times.
• Anyone wanting a gentle or measured hit. The GRAV Large Gravitron has one setting. The GRAV Coil Showerhead Water Pipe is the smooth, controlled alternative.
• Discreet or quick sessions. It takes two hands, a full base of water, and a bit of theatre.
• 14mm or 10mm accessory owners. The GRAV Large Gravitron is 19mm. Nothing smaller fits.
• Concentrate. A gravity bong is a flower device. There is no banger fitting for this.
• Travel. Two pieces of thick glass and a base of water.

Summary: The GRAV Large Gravitron suits big hits, groups and flower conservation, and does not suit beginners, concentrate or subtlety.

⚠️ Known Limitations

• The dose is large and it is not adjustable. A full bottle is a full bottle. The only control you have is how much you pack and how far you lift.
• It needs two hands and a surface. The GRAV Large Gravitron is not a piece you operate one-handed on a sofa.
• 19mm only. The largest of the three common joint sizes, and the least widely stocked. Check what bowls you own.
• Flower only. No banger fitting, no concentrate use.
• Lift too far and you lose the hit. If the bottle clears the waterline the seal breaks and the smoke escapes. This is the one technique mistake everybody makes once.
• Water gets everywhere if you rush. The bottle displaces water as it lowers. Fill the base halfway, not more.
• Two pieces of glass in contact. The silicone grommet exists to protect that, but the GRAV Large Gravitron still wants a stable surface and a careful hand.

Summary: The GRAV Large Gravitron delivers one large fixed dose, needs two hands and a half-filled base, and takes 19mm bowls only.

⚙️ Features & Benefits

• All-glass construction: The first gravity bong made entirely of glass, and still the reference. No plastic bottle taste, no scorched soda label.
• Closed system: Smoke is captured in the bottle and held there until you take it. Nothing is lost to the room, which makes the GRAV Large Gravitron the most flower-efficient piece GRAV produce.
• No draw required: Gravity fills the bottle. You provide a lighter and a lift, not lung power.
• Pressurised delivery: Lowering the bottle forces the smoke out. The hit is dense and arrives without effort.
• 5mm borosilicate: Five times thicker than the original Gravitron. Substantial in the hand and built to survive being lifted and set down repeatedly.
• Platinum-cured silicone grommet: Sits where the bottle meets the base, protecting both glass surfaces from wear at the one point they touch.
• Lifting flange: A raised ring around the top of the neck so the bottle can be gripped and lifted cleanly with one hand.
• 19mm female joint: Takes the included Funnel Bowl or any 19mm male bowl.
• Straight sides, no perc: The GRAV Large Gravitron has no slots, arms or coils, which makes it one of the simplest pieces in the range to clean.

Summary: A closed all-glass system, 5mm walls, a protective grommet and a lifting flange define the GRAV Large Gravitron.

📐 Structured Specs

Summary: The GRAV Large Gravitron is a two-piece 5mm borosilicate gravity bong with a 19mm female joint.

🔌 Compatibility & Requirements

Compatible with:

• Any 19mm male bowl. The included Funnel Bowl is the intended slide, and the GRAV Cup Bowl is stocked in 19mm as a direct alternative. The GRAV Large Gravitron is the only 19mm host piece in stock here, so that bowl and this pipe are a matched pair.
• Dry flower. Ground medium — too fine and it pulls through the bowl during the lift.
• Plain water in the base, filled halfway. No ice, no additives.
• Isopropyl alcohol and coarse salt. Straight glass sides make the GRAV Large Gravitron unusually easy to clean. Dr. Dabber ISO Snaps handle the bowl.

NOT compatible with:

• 14mm and 10mm bowls. The joint is 19mm. The GRAV Octobowl and the 14mm and 10mm Cup Bowls will not seat — those belong on the store's other GRAV pieces. The GRAV Medium Gravitron is the 14mm version of this product.
• Quartz bangers and concentrate. A gravity bong has no banger fitting. This is a flower device.
• Ash catchers, adapters and percolator attachments. The joint sits on the neck of a bottle that moves. Nothing hangs off it.
• Ice. The base holds the water the bottle displaces; there is no room and no pinch.
• Dishwashers and boiling water. Neither is safe, and heat will damage the silicone grommet.

Summary: The GRAV Large Gravitron takes 19mm male bowls and dry flower only, and accepts no attachments of any kind.

🧼 How to Use & Troubleshooting

Using the GRAV Large Gravitron. Gravity bongs are the one piece most people have never operated, so here is the full sequence:

1. Fill the base about halfway with water. Halfway, not more — the bottle displaces water as it lowers, and an over-filled base overflows.
2. Lower the bottle into the base so it sits down in the water.
3. Pack the 19mm Funnel Bowl and seat it in the joint at the neck of the bottle.
4. Light the bowl and lift the bottle at the same time. The rising bottle creates the vacuum that pulls air through the bowl. You do not draw on anything.
5. Stop before the bottle clears the water. This is the one mistake everyone makes once — lift too far, the seal breaks, and the whole bottle of smoke escapes.
6. Remove the bowl, put your mouth over the open neck, and push the bottle back down. The descending bottle pressurises the smoke and delivers it. Inhale as you lower.

Cleaning: Empty the base, separate the bottle, and wash both with isopropyl alcohol and coarse salt. Straight sides and no percolator mean everything is reachable, and the GRAV Large Gravitron is genuinely one of the easiest pieces in the range to get clean. Rinse the silicone grommet with warm water rather than solvent, and never put it near heat.

Troubleshooting:

• Problem: the smoke vanished before I took the hit. Solution: the bottle was lifted clear of the waterline and the seal broke. Lift less far.
• Problem: the bowl will not stay lit. Solution: you are lifting too slowly. The vacuum is what pulls air through the bowl — lift and light together, at a steady pace.
• Problem: water overflowed the base. Solution: over-filled. Halfway is the mark.
• Problem: flower pulled through into the bottle. Solution: ground too fine for the funnel bowl. Grind coarser, or use a screen.
• Problem: the hit is too much. Solution: pack less and lift less far. A half-filled bottle is a perfectly normal way to use the GRAV Large Gravitron.
• Problem: glass grinding against glass at the base. Solution: check the silicone grommet is seated. It exists specifically to keep those two surfaces apart.

For a broader walk-through of how to judge glass thickness and construction quality before buying, read our guide on how to select the best products from a premium smoke shop.

Summary: Fill the base halfway, lift and light together, stop before the bottle clears the water, and lower it to take the hit.

⚖️ Comparison Table

How to read this table. The first three are gravity bongs and the last two are conventional bongs, and they are not really competing — they do different things. Within the gravity bongs, the GRAV Large Gravitron and the Medium Gravitron are the same design at two scales, and the joint size differs between them: the Large is 19mm and the Medium is 14mm, so bowls are not interchangeable. Choose the Large for groups and the biggest hit; choose the Medium for personal use, a smaller dose, and the far more common 14mm bowl fitting.

Summary: The GRAV Large Gravitron is the largest gravity bong in the range and the only one with a 19mm joint.

💬 Common Questions & Answers

How does a gravity bong actually work?
Physics rather than lung power. A glass bottle sits in a base of water. When you lift the bottle, the space it leaves behind becomes a partial vacuum, and the only way air can get in is through the lit bowl at the neck — so the flower burns and the bottle fills with smoke without you drawing on anything. Then you remove the bowl, put your mouth over the neck, and push the bottle back down. The descending bottle compresses the smoke and pushes it out. With the GRAV Large Gravitron you are receiving the hit, not inhaling it.

What size bowl does it take?
19mm. This matters more than usual, because 19mm is the largest and least commonly stocked of the three joint sizes — and the GRAV Large Gravitron is the only 19mm piece in stock at Angies Boutique. The included Funnel Bowl is 19mm, and the GRAV Cup Bowl is stocked in 19mm as a direct alternative. Note that the Medium Gravitron uses a 14mm joint, so bowls do not swap between the two sizes.

Why is it more efficient than a normal bong?
Because it is a closed system. On a conventional bong the flower keeps smouldering between your pulls and that smoke drifts off into the room — you paid for it and you never inhale it. The GRAV Large Gravitron traps everything the bowl produces inside the bottle and holds it there until you are ready. Nothing escapes. GRAV describe it as a bud-saver, and that is the practical reason a gravity bong gets more out of the same amount of flower than almost anything else.

What is the one mistake people make?
Lifting the bottle too far. If the bottom of the bottle clears the waterline, the seal breaks and the entire volume of smoke escapes at once — the session is over before it starts. Lift steadily and stop while the bottle is still sitting in the water. It is the only real technique in operating the GRAV Large Gravitron, and everybody gets it wrong exactly once. The second mistake is over-filling the base, which overflows when the bottle comes back down.

Is it too strong for a beginner?
A full bottle is a very large dose delivered in one go, so treat it with respect at first. The good news is that it scales: pack a smaller bowl and lift the bottle only part way, and the GRAV Large Gravitron produces a proportionally smaller hit. There is nothing about the design that forces a full bottle. Someone who wants a gentler introduction is better served by the Medium Gravitron at $79.99, or by a conventional percolated bong.

How hard is it to clean?
Easier than almost anything else in the GRAV range, which surprises people. There is no percolator, no downstem, no slots and no coil — just two pieces of straight-sided glass. Separate the bottle from the base, wash both with isopropyl alcohol and coarse salt, and everything is reachable with a cloth or a cotton bud. Rinse the platinum-cured silicone grommet with warm water rather than solvent, and keep it away from heat.

How old is this design?
It was released in 2004 and it was the world's first all-glass gravity bong. GRAV built the company around it — the brand name comes from the Gravitron. What you are buying now is version 2.0: the same working principle, but with glass five times thicker at 5mm borosilicate, a platinum-cured silicone grommet protecting the bottle-to-base contact point, and a flange around the neck for lifting. Twenty years of production is an unusual amount of validation for any piece of glass.

Summary: The GRAV Large Gravitron uses a 19mm bowl, works by vacuum and pressure, wastes no smoke, and cleans easily.

🛒 Complete Your Gravitron Setup

• A spare bowl: the GRAV Cup Bowl in 19mm at $9.99 — the only 19mm bowl in stock, and this is the only piece it fits.
• Cleaning: Dr. Dabber ISO Snaps for the funnel bowl between washes.
• The smaller version: the GRAV Medium Gravitron at $79.99 on a 14mm joint — personal-sized, and a gentler introduction.
• A handmade alternative: the BigFun! Sublime Gravity Bong.
• Something smoother for every day: the GRAV Upline Water Pipe or the GRAV Medium Round Base Bong.

Browse the wider ranges in Bongs and Glass Pipes.

Summary: Pair the GRAV Large Gravitron with a spare 19mm bowl and isopropyl cleaning supplies.

✅ Authentic & Ready to Ship

The GRAV Large Gravitron sold here is authentic GRAV glass. Angies Boutique buys direct from GRAV as an authorized dealer, so every piece arrives as GRAV packed it, with the 19mm Funnel Bowl and the silicone grommet included.

Priced at $99.99 — the same price GRAV charge on their own site. In stock and ready to ship, or collect it the same day in person at 838 N Broadway, Los Angeles, CA 90012.

Summary: The GRAV Large Gravitron is authentic, in stock at $99.99, and available for same-day pickup in Los Angeles.