Modify upgraded air nozzles feature an extra O-ring to minimize air loss between a cylinder head and a hopup unit. 

The AEG air seal nozzle is the device between the gearbox and the hop-up unit that loads BBs into the hop-up in preparation for firing an airsoft gun.

• Features an internal o-ring for improved air seal
• For Echo1/Classic Army/Star SCAR-L series and some other brands which use an extra long nozzle
• Made of high-grade POM, which features its oilless for an improving durability
• Length is approx. 29mm, please check your nozzle length before ordering!