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Modern inflatable lifejackets rely on CO2 cylinders and automatic firing mechanisms that require regular inspection and professional servicing. Standard lifejackets, such as the Seago 150N, feature a bladder, oral inflation tube, whistle, and a light that activates upon water contact.0:54 Automatic firing heads use a water-soluble pellet that dissolves to release a spring-loaded pin, piercing the CO2 cylinder to inflate the bladder.5:24 Hydrostatic units, which trigger based on water pressure, are more complex to install and often require professional maintenance to ensure a proper seal.6:53 Users should check cylinders for corrosion or puncture holes and verify that indicators show green.4:51 Features like integrated hoods, crotch straps, and quick-adjust buckles improve safety and comfort.3:19 Because bladders can develop leaks or suffer damage over time, professional testing involves inflating the unit and monitoring it for pressure loss over 24 hours.9:59 Sailors should test their specific lifejacket in a controlled environment, such as an RYA Sea Survival course, to understand how it performs during an emergency.4:28

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