Jetboil PCS/GCS Igniter Maintenance Kit Replacement o-rings in the kit keep all components of your JetBoil stove secured together for maximum performance and ultimate durability. Replace your old jet with the brand new one in the kit, which ensures properly cooked meal every time. Components in the kit are not compatible with Flash or Helios systems because of their specialized design made specifically for certain stoves. Compatible with PCS/GCS systems and made to perfectly fit each component with accuracy. Comes with a replacement piezoelectric igniter, so your stove lights up without complications and takes full advantage of your fuel supply.