• These pre-filters are original equipment with our Convertible plant burners and prohibit the migration of ash into the water
• 21mm fritted disc pre-filters
• Recommended for use with inverted 19/24 adapters and 24mm bowls for flower consumption in concentrate burners
Note: Pre-filters are 18mm in diameter and will not work with any of our pieces that utilize either the 14mm or 19mm outer ground joints. Only compatible with 24mm inner ground joint/adapter setups.