1.1 This part of ISO 14469 applies to compressed natural gas (CNG) vehicle nozzles and receptacles hereinafter referred to as devices, constructed entirely of new, unused parts and materials. CNG fuelling connection nozzles consist of the following components, as applicable: a) receptacle and protective cap (mounted on vehicle) (see Clause 7); b) nozzle (see Clause 5). 1.2 This part of ISO 14469 applies to devices which have a service pressure of 250 bar, hereinafter referred to as B250 [see 9 a) 3)]. This part of ISO 14469 refers only to a service pressure of 250 bar. 1.3 This part of ISO 14469 applies to devices with standardized mating components (see 5.8 and 7.7). 1.4 This part of ISO 14469 applies to connectors which: 1) prevent natural gas vehicles from being fuelled by dispenser stations with service pressures higher than that of the vehicle; 2) allow natural gas vehicles to be fuelled by dispenser stations with service pressures equal to or lower than the vehicle fuel system service pressure. 1.5 This part of ISO 14469 is applicable to compressed natural gas in accordance with ISO 15403. 1.6 All references to pressures (bar) throughout this part of ISO 14469 are to be considered gauge pressures unless otherwise specified.