Bong Parts Explained: Complete Diagram & Guide
Confused by bong parts? Learn what the mouthpiece, neck, ice catcher, chamber, downstem, cone piece, shotty, joint and percolator do in this complete Billy Mate guide.
Ever looked at a glass bong and wondered what every part actually does? A simple bong might only have a few components, while more advanced designs can include ice catchers, diffused downstems, percolators, removable cone pieces and multiple chambers.
Understanding the different parts makes it much easier to:
- Choose the right bong
- Replace broken glass parts
- Check accessory compatibility
- Understand joint sizes
- Clean your bong properly
- Compare different bong designs
This Billy Mate guide breaks down the most common parts of a glass bong from top to bottom.
A typical glass bong may include a mouthpiece, neck, ice catcher, main chamber, percolator, base, joint, downstem, cone piece, shotty and diffuser.
Not every bong has every feature. A basic straight bong may have only a mouthpiece, chamber, downstem, cone piece and base. A more advanced bong might contain several percolators and additional filtration chambers.
Let's look at each part individually.
The mouthpiece is the opening at the very top of the bong. It is where the user places their mouth. Most glass bongs have a smooth rounded or flared rim to make the opening more comfortable.
Mouthpieces can vary significantly in diameter. A small bong may have a relatively narrow mouthpiece, while a larger 30cm or 35cm bong may use a much wider opening.
What to Look For
A good glass mouthpiece should have:
- Smooth finished edges
- No chips or sharp areas
- Even glass thickness
- A comfortable opening
The mouthpiece is also one of the areas that should be cleaned regularly because it is in direct contact with the user.
The long glass section beneath the mouthpiece is generally called the neck or tube. The neck connects the mouthpiece to the main chamber.
On a simple straight bong, the neck and chamber may effectively be one continuous tube. On a beaker bong, the neck usually leads into a much wider lower chamber.
The neck can also contain additional features such as ice catchers, percolators, decorative glass, splash guards and Billy Mate branding. Longer necks also provide designers with more room for additional internal features.
An ice catcher is usually formed from several glass pinches inside the neck. These small glass points create a platform that can hold ice above the water chamber. You can identify an ice catcher by looking inside the bong neck for several pieces of glass protruding inward.
What Does an Ice Catcher Do?
Its main purpose is simply to hold ice inside the neck without allowing it to fall into the lower chamber. Not all bongs include one. Compact designs may not have enough room, while larger bongs commonly feature ice catchers.
Important Cleaning Tip
Ice catchers create small internal corners where residue can accumulate. When cleaning a bong with an ice catcher, make sure cleaner reaches around the glass pinches rather than simply rinsing the main tube.
The main chamber is the area where water is held. Its shape depends heavily on the bong design. Common chamber shapes include the straight tube, beaker, bubble, round base, multi-chamber and recycler-style chambers.
The chamber is one of the biggest differences between bong styles. For example, a beaker bong has a wider lower chamber, while a straight bong maintains a more consistent diameter.
The base is the bottom section that supports the bong. Its design has a major effect on stability.
Beaker Base
A beaker bong widens toward the bottom. This creates a larger footprint and gives the piece its familiar laboratory beaker shape.
Straight Base
A straight bong may use a flat circular glass foot attached to the bottom of the tube.
Thick Glass Base
Some bongs use a particularly thick base to add weight and improve stability.
When comparing bongs, it is worth looking at the base diameter as well as total height. A 30cm bong with a 130mm base can feel very different from a narrow 30cm straight bong. Our Bong Sizes Explained: 20cm vs 25cm vs 30cm vs 35cm guide covers how height and base width affect the feel.
The joint is the ground-glass connection where removable components fit into the bong. Common sizes include 14mm and 19mm. At Billy Mate, we use the simpler 14mm and 19mm terminology. Some manufacturers may describe similar standards as approximately 14.5mm and 18.8mm. The important thing is that the joint size of the bong and accessory must match.
Why Joint Size Matters
Joint size determines whether components such as downstems, cone pieces, ash catchers, bangers and adapters will fit. If you are unsure which joint your bong uses, read our 14mm vs 19mm Bong Joint Size Guide.
The downstem is the glass tube that runs from the bong joint into the water chamber. It provides the pathway between the cone piece and the water. Many Billy Mate glass bongs use a removable glass downstem, which means it can be taken out for cleaning or replaced if damaged.
Downstems vary by joint size, overall length, joint-to-bottom length, glass colour and diffuser design. This is why replacement downstems need to be measured rather than chosen by appearance.
What Is a 19/14mm Downstem?
A common configuration is a 19/14mm downstem. That generally means a 19mm connection into the bong and a 14mm opening for the cone piece. The two numbers describe two different ends of the same stem.
A diffuser is located near the bottom of many downstems. Instead of having only one large opening, a diffused downstem has several smaller slits or holes. These divide the airflow into multiple smaller streams as it enters the water.
You may see different designs including multiple vertical slits, horizontal slits, small holes, and open-bottom designs combined with slits. Billy Mate carries a range of diffused downstems in different lengths and colours.
Diffused vs Standard Downstem
A standard stem may simply have an open end. A diffused stem adds multiple openings around the bottom. When replacing a downstem, first make sure the joint size and length are correct, then consider the diffuser style.
The cone piece is the removable glass or metal component that sits at the top of the downstem or bong joint. In Australia, this is commonly called a cone piece or simply a cone. You may also see the term "bowl" used internationally.
Billy Mate glass cone pieces are available in different sizes and styles. Common options include 14mm glass cone pieces, 19mm glass cone pieces, cone pieces with handles, coloured glass, gradient glass, mini glass cone pieces and brass cones.
The most important specification is the joint size. A 14mm cone piece needs the appropriate 14mm connection.
Many modern glass cone pieces include a small glass handle protruding from the side. The handle gives you somewhere to grip the cone piece without holding the main bowl section directly. Handles can also make small glass cone pieces easier to remove from the joint. On Billy Mate products, the handle may be clear or coloured depending on the design.
The shotty is particularly familiar to Australian bong users. It is a small opening in the bong that can be covered with a finger during use. Internationally, a similar feature is often called a carb hole.
Some Billy Mate bongs have a traditional shotty built into the glass. Others may include a rubber shotty cap, allowing the hole to remain sealed when required. Not all modern glass bongs have a shotty. Many rely entirely on a removable cone piece instead.
A percolator, often shortened to perc, is an internal glass structure designed to create additional bubbling inside the bong. There are many different percolator designs. Common examples include tree percs, showerhead percs, honeycomb percs, inline percs, matrix-style percs and multi-arm percs.
Some bongs contain one percolator. Others contain two or more stacked inside separate chambers.
How Do You Recognise a Perc Bong?
Look inside the bong. If you see an additional glass structure with multiple holes, slits or arms inside the chamber, it is probably a percolator. These designs can look dramatically different depending on how the glass is constructed.
Some more complex glass bongs include a splash guard. A splash guard helps reduce water travelling upward toward the mouthpiece. It may appear as a domed piece of glass, a narrowed section, an internal disc or part of a percolator chamber. Splash guards are more common in larger or multi-chamber glass pieces.
An ash catcher is technically an accessory rather than part of the basic bong itself, but it is worth understanding because it connects directly to the bong joint. It sits between the bong and cone piece.
Ash catchers are available in different joint sizes, angles, shapes, dry designs and water-filtered designs. A dry ash catcher collects material without adding another water chamber. Other ash catchers include water and may provide additional diffusion.
Compatibility is important because the joint size and joint angle both need to be correct.
A glass adapter allows different glass fittings to connect. For example, an adapter may allow an accessory designed for one joint size to work with another. Adapters can also change joint size, male or female connection, angle and accessory position.
They can be useful, but whenever possible, using an accessory that directly matches the bong is generally the simplest setup.
For a typical glass bong, the anatomy runs from top to bottom like this:
- Mouthpiece
- Neck
- Ice catcher
- Main chamber
- Water
- Base
Entering through the side:
- Cone piece
- 14mm connection
- Downstem
- Diffuser
- Water chamber
Nearby you may also find a shotty, and inside more advanced bongs, one or more percolators. That is essentially the basic anatomy of most modern glass bongs.
This depends on how the bong is constructed.
Common Replaceable Parts
These are often removable:
- Cone piece
- Downstem
- Ash catcher
- Adapter
- Rubber shotty cap
- Some external accessories
Usually Permanent Parts
These are normally built into the bong:
- Mouthpiece
- Neck
- Base
- Ice catcher
- Internal percolator
- Shotty hole
- Main chamber
If an integrated glass component breaks, replacing the entire bong may be more practical than repairing it.
This is where many people get confused. The parts do not all need to be the same physical size. They need to have compatible connections.
For example, a bong may use a 19mm bong joint, a 19/14mm downstem and a 14mm glass cone piece. That is completely normal. The 19mm end of the stem fits the bong, and the 14mm end receives the cone piece.
These measurements should never be confused.
Joint Size
Usually expressed in millimetres, such as 14mm, 19mm or 19/14mm.
Downstem Length
Usually expressed in centimetres, such as 8cm, 10cm, 12cm, 13cm or 16cm.
A stem can have the correct joint size but still be too long or too short for the bong. That is why our How to Measure a Bong Downstem Correctly guide covers both measurements.
The basic components are similar, but the chamber and base are different.
Straight Bong
A straight bong generally features a straight vertical chamber, a flat circular base, a removable or fixed downstem, a cone piece, an optional ice catcher and an optional percolator.
Beaker Bong
A beaker bong generally features a narrow upper neck, a wide lower chamber, a flared beaker base, an angled downstem, a cone piece, an optional ice catcher and an optional percolator.
The wider base is one of the easiest ways to identify a beaker bong.
A simple bong may only need a mouthpiece, chamber, water, downstem and cone piece. A percolator bong adds one or more internal filtration structures. This is why more advanced glass bongs often look much more complicated when viewed from the outside. More glass components also mean more areas that need to be cleaned.
Knowing the names of the components is not just about terminology. It makes shopping much easier.
Instead of saying "I need that glass thing that goes inside the bong", you can identify it as "I need a 19/14mm diffused downstem". And instead of "the little glass bowl broke", you can look for "a 14mm glass cone piece".
Once you understand joint size, stem length and component names, finding replacement parts becomes dramatically easier.
| Bong Part | What It Does | Usually Replaceable? |
|---|---|---|
| Mouthpiece | Top opening | No |
| Neck | Connects mouthpiece to chamber | No |
| Ice catcher | Holds ice in neck | No |
| Chamber | Holds water | No |
| Base | Supports bong | No |
| Joint | Connects glass fittings | No |
| Downstem | Runs into water chamber | Often |
| Diffuser | Creates multiple airflow openings | Part of stem |
| Cone piece | Fits into stem or joint | Yes |
| Shotty | Small air opening | Usually built in |
| Percolator | Internal diffusion structure | Usually built in |
| Ash catcher | External accessory | Yes |
| Adapter | Changes connection configuration | Yes |
Billy's Tip: When replacing any glass bong part, do not rely on appearance alone. Check:
- Joint size
- Length
- Male or female connection
- Joint angle, where relevant
- Whether the component is removable or built in
A quick measurement before ordering can save you from ending up with a replacement part that looks right but does not fit.
Billy Mate offers a growing range of replacement glass and bong accessories, including replacement glass downstems, diffused downstems, 14mm glass cone pieces, ash catchers and glass adapters. You can also browse the full range of Billy Mate glass bongs.
Product specifications include measurements wherever possible to make compatibility easier to understand. If you are not sure which component you need, start with the joint size and downstem measurements before choosing a replacement.