No - cylinder thread, cylinder weight and firing head type all vary between manufacturers and models.

A cylinder that screws in but is the wrong weight will under-inflate.

A firing head from another model may not fit or may not fire.

Matching the kit to the specific jacket is the first step.

Jackets state the required kit, usually on a label inside the cover.

Mixed fleets need mixed kit stocks, which is an argument for standardising on one model.

By weighing it - a cylinder can lose gas slowly with no visible sign.

The full weight is stamped on the cylinder itself.

Cylinders that look identical can carry different gas charges.

A partly discharged cylinder will under-inflate the bladder.

Corrosion at the neck or threads is a separate reason to reject.

Weighing is a quick check and is part of every routine inspection.

The water-soluble element that triggers inflation degrades with humidity over time.

An expired head may fire late or not at all.

They are replaced on schedule rather than when they fail.

Expiry dates are marked on the head or bobbin.

This is the component most often found out of date during inspection.

Humid storage shortens their life relative to the printed date.

Lights, spray hoods, harness points and locator devices - each addresses a real failure mode.

Lights activate on immersion and make a person findable at night.

Spray hoods keep water off the face in a seaway, addressing a genuine drowning mechanism for someone floating correctly.

Harness points allow a safety line to be clipped so the wearer does not enter the water at all.

Personal locator beacons and AIS devices report a position to rescuers.

Which are appropriate depends on how far from help the wearer will be.

Dry, loosely packed, out of sunlight and away from heat.

A jacket stored damp will corrode its cylinder.

It may also fire its automatic head in storage, which wastes a kit and leaves the jacket unusable.

Ultraviolet degrades outer fabrics and webbing.

Tightly packed bladders can crease and weaken over years.

Storage conditions affect service life more than anything except actual use.

Rearming is generally a user task; full service is not.

Manufacturers publish rearming instructions and they are straightforward.

The critical checks are the correct kit, a full cylinder and a head within date.

After rearming, many jackets have an indicator confirming the head is correctly armed.

Full periodic service - bladder pressure testing and inspection - is a different activity.

The manufacturer states a service interval and the regulations may state another; both apply.

Service dates, cylinder and head expiry dates, and which jacket each applies to.

An inflatable jacket's readiness depends on components with dates.

Tracking them by jacket is what prevents a fleet drifting out of date.

Recording rearming after any inflation closes the loop.

Records are what demonstrate the equipment is fit for use if questioned.

Requirements for retention are set by the local regime and often by the operator's own safety management system.