Downstems

Downstems: The Small Upgrade That Makes a Big Difference

A downstem;  also called a bong stem or water pipe stem, is the small but important piece that connects your bowl to the water chamber of your bong. It’s what pulls the smoke down into the water, starting the cooling and filtration process.

It might look like a simple glass tube, but the right downstem can make a big difference. A properly sized glass downstem for your bong improves airflow, smoothness, and overall flavor.

In this collection, you’ll find a variety of options to fit different setups, including:

• 14mm downstems
• Diffused downstems for smoother hits
• Angled downstems for specific bong designs
• Female downstems
• Dab rig stems for concentrate setups

Each piece is designed to fit a range of water pipes and rigs, helping you upgrade performance with the right fit and function.

Why a Quality Downstem Matters

Upgrading your downstem diffuser can:

• Improve smoke cooling and filtration
• Create smoother, less harsh hits
• Enhance flavor clarity
• Optimize airflow and draw resistance
• Replace broken or outdated bong stems with a better-performing fit

Many downstems feature diffuser slits or holes that break smoke into bubbles, increasing water contact for cleaner, smoother hits.

Types of Downstems 

Glass Downstem

Crafted from high-quality borosilicate glass, providing heat resistance, purity of flavor, and durability.

Diffused Downstem

Equipped with slits or holes that function as a downstem diffuser, providing enhanced filtration and a smoother hit with each draw.

Angled Downstem

Engineered for optimal airflow and compatibility with angled bong joints.

Female Downstem

Designed to work in tandem with male bowls or adapters for easy setup.

Dab Stem / Dab Rig Stem

Optimized for concentrate rigs, with tighter airflow and dab accessories compatibility.

Pull Stems & Classic Stems

Basic glass stems for smoking, great for replacements or minimalistic builds.

How to Pick the Perfect Downstem for Your Bong

To pick the perfect downstem for a bong, you need to consider three important specs:

Joint Size

Typical sizes are 10mm, 14mm, and 18mm,  your downstem should be the same size as your bong’s joint.

Length

From the top of the frosted joint to the tip,  too short and it won’t reach the water, too long and it won’t fit in right.

Joint Gender

Female joints are most common on bongs, which means you’ll need a male downstem.

Diffused vs. Regular Downstems

• Regular Downstem → Straightforward airflow
• Diffuser Downstem → Slits or holes to create smaller bubbles for a smoother hit
• Perc Downstem → Advanced filtration with showerhead or multi-hole diffusion

A diffused downstem is essentially the filtration system upgrade that makes an average bong a better daily smoking experience.