The Cla-Val Model 341GF/342GF Severe Duty Nozzle is a refueling nozzle for pressure fuel servicing of aircraft, and for bottom loading of tank trucks.

To ensure maximum safety during refueling, the Cla-Val 341GF/342GF Nozzle has primary and secondary interlock systems. The primary interlock ensures that the nozzle cannot be opened when it is not connected to an aircraft adapter. The secondary interlock protects the nozzle from hazards of interfacing with badly worn aircraft adapters. Even when used with a badly worn adapter, the nozzle is safer because it uses square register pins that provide positive alignment with the square slots in the adapter. In addition, the nozzle cannot be removed from the adapter until the operating lever is rotated to the fully-closed position.

To achieve maximum strength and durability, the Cla-Val 341GF/342GF Nozzle uses a stainless steel bayonet ring cast within the aluminum collar of the nozzle. The crank shaft of the nozzle extends across the entire width of the interior flow path and is supported from end-to-end by a structural wall that splits the flow path. This wall supports the crank shaft while straightening the flow and keeping flow resistance as low as possible. To reduce aircraft refueling times, the flow resistance though the Cla-Val 341GF/342GF Nozzle has the lowest head loss, which means it can fill an aircraft faster than any other nozzle.

341GF Nozzles are configured for military service and 342GF Nozzles are configured for commercial refueling service.