Dabbing accessory that restricts airflow and traps heat around domeless nails or bangers, allowing the cannabis concentrate to vaporize at a lower temperature, preserving the quality and flavor of the concentrate. 

This carb cap is essential for my set of dab tools.

Before I created a homemade carb cap, all my concentrates tasted the same — but now that I have it, I can really taste the difference.

What is the purpose of carb caps?

The carb cap was invented by Task Rok, founder of dab accessories company Highly Educated, in 2013. The term carb cap comes from the word carburetor. A carb cap is to a dabbing rig what a carburetor is to a car. Just like a carburetor controls the airflow, and, as a result, the pressure around an engine, a carb cab controls the airflow and, as a result, the pressure around a dab.

glass quartz nail banger carb cap
A carb cab controls the airflow and, as a result, the pressure around a dab.
Photo by: Gina Coleman/Weedmaps

Different types of carb caps

While the functionality of all carb caps is the same — to trap heat and lower the temperature at which dabs will vaporize — there are a number of different types and styles that are ideal for different dabbing setups.

Some popular types of carb caps include:

Standard carb caps

Standard carb caps are simple, with a rounded end that acts as the cap and a handle to hold during the dabbing process.

Bubble carb caps

Named for their bubble-like shape, bubble carb caps have hollow stems that extend from both the top and bottom of the cap, creating the carb. They were designed to work with the flat-top quartz carb cap, The rounded shape creates a seal against the flat top, which allows the concentrate to vaporize faster. The shape also allows carb cap dabbers to easily rotate the dab cap, which can move the concentrate across the banger faster (known as chasing), making for a more efficient dab.

Directional carb caps

Directional flow carb caps also create a seal on banger-style nails, but a directional flow carb cap features a carb hole and a thin, angled stem that extends from the bottom of the cap. When rotated, the airflow created by the stem will chase the concentrate around the surface of the nail, allowing it to vaporize more quickly.

In terms of materials, most carb caps are titanium, quartz, or glass.

How do you use a carb cap?

Step 1: Apply a dab to heated nail or banger surface.

Step 2: Cover the nail or banger with the carb cap.

Step 3: If you're using a directional flow or bubble carb cap, gently twist or rotate the carb cap, which will spread the concentrate across the nail surface by pushing the flow of air around the chamber. If you're using a standard dab tool with carb cap or a cap with a flat base, use a gentle up-and-down motion to control the airflow.

Step 4: When you're ready to inhale the vapor, remove the carb cap to clear your rig.

Where to buy a carb cap

Carb caps have no other use other than as a dab accessory, so the only place you'll find them is at dispensaries, smoke shops, or online cannabis accessory retailers.

The benefits of using a carb cap

The main benefit of using a carb cap is that it allows concentrates to be vaporized at a much lower temperature. When the nail of a dab rig is heated to an extremely high temperature — torches can heat the nail to upwards of 1,000 degrees Fahrenheit, or about 538 degrees Celsius  — it can effectively destroy the taste and potency of the dab, leaving dabbers with a burnt, ineffective vapor. By dabbing with a low temp carb cap, heating to only 300 and 400 degrees Fahrenheit, or about 149 to 204 degrees Celsius, dabbers can experience the full flavor and taste profile of the concentrate while maintaining the terpenes, which preserves the concentrate's therapeutic and intoxicating effects.

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The information contained in this site is provided for informational purposes only, and should not be construed as medical or legal advice. This page was last updated on June 9, 2021.