Quick answer
For a Byrna SD or LE, the replacement CO2 cap fits securely and is easy to install by hand. Follow the steps below to swap it out and avoid leaks.
Why the cap matters and when to replace it
The CO2 cap seals the gas cartridge inside your Byrna launcher. A worn or damaged cap can cause slow leaks or a sudden loss of power, so replacing it at the first sign of trouble keeps your device reliable.
This cap is compatible with the Byrna EP, SD, SDXL, and LE, but not with the Byrna CL. If you own a CL, this cap won't fit, so check your model before ordering.
How to install the replacement CO2 cap
- Confirm your model: Check that your launcher is a Byrna EP, SD, SDXL, or LE. The cap does not fit the Byrna CL. If you own a CL, stop here and order the correct part.
- Depressurize the launcher: Ensure no CO2 cartridge is loaded and the launcher is unpressurized. Fire any remaining gas in a safe direction if needed. Never attempt removal with a punctured cartridge inside.
- Remove the old cap: Twist the existing cap counterclockwise to unscrew it. If it's stuck, use a cloth for grip, but avoid tools that could damage the threads. Check the old cap for cracks or deformation to confirm replacement is necessary.
- Align and hand-tighten the new cap: Place the new cap over the CO2 chamber and turn clockwise until snug. Do not overtighten; hand-tight is sufficient for a secure seal. Overtightening can strip threads and cause leaks.
- Test for leaks: Insert a fresh CO2 cartridge and check for hissing sounds or a drop in pressure. If you hear a leak, remove the cap and reseat it. A quick test after installation prevents surprises later.
Product details
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Replacement CO2 Cap for Byrna SD/LE: The replacement CO2 cap fits most Byrna handheld .68 pistols, including the EP, SD, SDXL, and LE, but is not compatible with the Byrna CL. Before purchasing, confirm your model is on the compatible list to avoid a wasted order and a cap that doesn't seal.
Replacement CO2 Cap for Byrna SD/LE
