Thermacell C4 Mosquito Repellent Refill Cartridges - 4 Pack

The Thermacell C4 Repellent Refill cartridges deliver 48 hours of effective mosquito protection across a 15-foot zone without producing detectable odors. These fuel cartridges power Thermacell devices to create an invisible barrier against biting insects in outdoor environments.

What Makes This Different

Unlike topical repellents that require skin application, the C4 cartridge system creates a protective perimeter around your location. Each cartridge contains refined butane fuel that heats allethrin-treated mats to release mosquito-repelling vapor. The odorless formula won't interfere with hunting scenarios or outdoor dining while maintaining consistent protection levels throughout the coverage area.

Key Features

• 48-hour runtime per cartridge provides extended protection sessions
• 15-foot effective radius covers approximately 700 square feet
• Odorless operation won't alert game animals or disturb outdoor activities
• Compatible with all Thermacell mosquito repellent devices
• Four-cartridge pack supplies up to 192 hours of total protection
• No DEET or other skin-applied chemicals required
• Operates in temperatures from 50°F to 95°F

Field testing demonstrates reliable ignition and consistent heat output across the full cartridge lifespan. The refined butane formula burns cleanly without producing visible smoke or residue that could compromise concealment during hunting applications. Performance remains stable in moderate wind conditions up to 6 mph, though effectiveness decreases in stronger air movement.

Technical Specs

• Fuel Type: Refined butane gas
• Runtime: 12 hours per cartridge
• Coverage Area: 15-foot radius (706 square feet)
• Operating Temperature Range: 50°F to 95°F
• Cartridge Dimensions: 2.5" x 1.0" diameter
• Package Contents: 4 fuel cartridges
• Compatibility: All Thermacell repellent devices
• Storage Temperature: -4°F to 120°F

The C4 refill system eliminates the need for messy sprays or sticky lotions while providing consistent protection levels. Professional outfitters and recreational users rely on this cartridge design for reliable mosquito control during extended outdoor activities.