When it comes to bongs, the spotlight often goes to the big hitters — beakers, percs, and all those fancy attachments. But sitting quietly between the bowl and the water chamber is one of the most crucial components of them all: the bong downstem. Whether you're new to bongs or looking to upgrade your setup, understanding this underrated accessory can make a serious difference to your sesh.
So, let’s break down what downstems actually do, the different types available, and how to pick the right one for your favourite glass piece.
What is a Downstem?
The glass downstem is a tube that connects your bong’s bowl (or cone piece) to the water chamber. It’s the part that carries the smoke from the burning herb down into the water where it's cooled and filtered before you inhale. It might not seem like much, but it plays a huge role in airflow, filtration, and the overall quality of your rip.
Without a downstem? You’ve basically got a glorified vase.
Why Downstems Matter
While some modern bongs feature fixed downstems (built into the glass), most classic bongs use removable ones. A good downstem improves your smoking experience in three major ways:
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Smoothness: It pulls the smoke into the water chamber, cooling it down for a smoother inhale.
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Filtration: It helps remove unwanted particles and toxins, especially if it’s a diffused downstem.
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Airflow: A clean, well-fitted downstem maintains proper airflow, reducing harshness and drag.
Basically, if your bong has a dodgy downstem, you’ll feel it — in the throat and in the lungs.
Types of Downstems
Like everything in the world of bongs, downstems come in a variety of shapes, lengths, and styles. Here’s a breakdown of the most common types:
1. Standard Downstem
The basic straight tube — does the job, no frills. Great for older-style bongs or budget setups.
2. Diffused Downstem
These have small slits or holes at the bottom to create more bubbles in the water, increasing filtration and smoothness. A crowd favourite.
3. Multi-Slit Downstem
A more intense version of the diffused downstem — extra slits mean extra bubbles and a much smoother hit.
4. Adjustable Downstem
These come with interchangeable parts that allow you to adjust the length. Handy if you're switching between bongs or aren’t sure what size you need.
Joint Sizes and Compatibility
Downstems come in a range of joint sizes, and getting the right one is essential:
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14mm downstems: The most common for medium-sized bongs.
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18mm down stems: Found in larger bongs for bigger hits and more airflow.
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18/14mm downstems: Good for medium sized beakers
Pro tip: Too long and it clogs your water; too short and it doesn’t filter properly. Always measure your old downstem or bong chamber before buying a new one.
How to Choose the Right Downstem
Not sure what downstem will suit your setup? Here are some tips:
1. Measure Twice, Smoke Once
Use a ruler to measure your existing downstem from the bottom of the ground joint to the tip. That’s your starting point.
2. Consider the Joint Angle
Most Aussie bongs have a 45° angle between the neck and the stem, but some are 90°. Make sure the downstem matches your bong’s design.
3. Go for Diffused if You Want Smoother Hits
If you're upgrading, a diffused or multi-slit downstem will instantly improve your smoke quality.
4. Match the Joint Size to Your Cone Piece
If you’re running a 14mm cone, make sure the downstem joint also supports a 14mm fitting. Otherwise, you're asking for drama mid-session.
Still unsure? Make sure to read our article: How to measure your downstem
When Should You Replace Your Downstem?
If your downstem is showing any of the following signs, it might be time to switch it out:
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It’s broken or cracked (obviously).
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It’s clogged and won’t clean properly.
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It's too short or long and isn’t filtering efficiently.
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You want a smoother, bubblier hit with better airflow.
Luckily, they’re easy to replace — just make sure you grab the right size.
Downstem Pro Tips from The Bong Baron
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Always keep a spare: Accidents happen, and nothing kills a sesh quicker than a shattered downstem.
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Clean regularly: Resin builds up fast. A clean downstem = cleaner flavour.
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Try a diffuser: If you haven’t already, switching to a diffused downstem is a simple upgrade that can transform your smoking experience.
Where to Buy Quality Downstems in Australia
You can browse The Bong Baron's full Downstem collection here — including 14mm and 18mm sizes, plus both standard and diffused styles.
We also stock cone pieces, ash catchers, and other accessories to complete your setup. And yes — we ship Australia-wide, discreetly and quickly.
Final Thoughts
They may be small, but downstems are the unsung heroes of the bong world. Whether you're replacing a broken one or levelling up with a diffuser, choosing the right downstem can elevate every puff.
Clean hits. Better bubbles. Baron-approved.
Explore more in our accessory series:
→ Read the full pillar blog: A Deep Dive Into Bong Accessories
