Lifeline straight connectors. If you need to pass your Lifeline extinguisher pipe through a bulkhead, the best method is to utilise one of their specific bulkhead fittings, there's dramatically less chance of damage to the pipe this way and it'll bring you peace of mind.
Quality Genuine Lifeline extinguishers spares
Available for both the 6mm and 10mm pipe sizes
Manufactured from tough ABS plastic for reliability