What is a Downstem?
A downstem is a key part of any water pipe. It is a glass tube that connects your bowl piece to the water chamber of your bong. It plays a key role in creating an airtight seal, pulling smoke into the water for cooling and filtration.
Bong downstems can be removable or fixed. Manufacturers build fixed downstems into the bong, and users cannot replace them if they are broken. Removable downstems offer easy personalization and replacement.
To select the right one for your setup, you must know its size, type, and features. They must match your bong and your preferences. Here's a comprehensive guide to help you choose the perfect downstem.
Key Factors in Choosing a Downstem
1. Size
It's size depends on your bong's joint size and the downstem’s length.
Joint Sizes
Most downstems are made with ground glass joints, ensuring a snug fit. Common joint sizes include:
- 10mm: Rare and typically found in oil rigs.
- 14mm: The most common size for most bongs.
- 19mm: Often used for larger bongs and stemless designs.
- 9.5mm: Found in older or grommet-style bongs.
To measure your joint size without a ruler, try these tricks:
- A 14mm joint is roughly the diameter of your pinky finger.
- An 19mm joint is closer to the width of your thumb.
- A AA battery will fit tightly into a 14mm but will be loose in a 19mm.
Length Measurement
The length of your bong's downstem should allow it to reach into the water without hitting the bottom of the bong. To measure, insert a pencil or similar object into the joint until it hovers just above the bong’s base. Mark where the pencil exits the joint and measure this length. Subtract about 1 inch to account for the frosted joint part of the downstem.
2. Male vs. Female Joints
Modern bongs usually have female joints designed to fit male bowls. Female joints have the ground section inside the joint, and male joints have the ground section on the outside. Ensure compatibility between your downstem and bowl.
3. Diffusion
Downstems often have features that help filter and cool the smoke. Common styles include:
- Slitted: Simple and reliable, with evenly spaced slits.
- Holed: Enhance percolation without excessive drag.
- Percolated: Offer advanced filtration but need stronger pulls.
Steps to Buying a Downstem
- Measure The Length: Insert a pencil or straight object into the joint, mark along the top of the joint, then subtract the joint’s frosted length (about 1 inch).
- Determine Joint Size: Use your pinky or thumb as a guide, or test with a dime.
- Confirm Bowl Compatibility: Ensure the downstem matches the size and gender of your bowl.
Conclusion
Choosing the correct downstem is crucial for function. Take accurate measurements of your bong’s joint size and base depth, and consider your desired diffusion. At Castle, we offer a wide range of high-quality downstems to suit any preference. Explore our collection today and find the perfect match for your bong!
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