Release cartridge United Moulders UML Pro Sensor MK2 for automatic lifejackets with United Moulders (UML) Pro Sensor MK1 release system. The set contains the release cartridge. Replacement should be carried out according to the expiry date printed on the cartridge. At least one complete maintenance set including cartridge and gas container should always be carried on board to make deployed lifejackets ready for use again on site!