Fill Valve for Elite Force VFC Spartan GLOCK GBB Airsoft Magazines Rail segment SLEEP MODE: ETU will go

SLEEP MODE: ETU will go to sleep mode if your gun is idle for an hour， which prevent the battery from discharge

Dye thermal lenses provide the benchmark for anti-fog performance

LOW BATTERY WARNING: When the voltage drops to a critical level

The 3 fin design paired with the "Fishbone" style spacer also improves the surface area which contacts the BB

Fill Valve for Elite Force VFC Spartan GLOCK GBB Airsoft Magazines Rail segment SLEEP MODE: ETU will goDurable, cold resistant brass construction Plated "head" provides extra reliability Replaces the stock injection valve on your gas airsoft replica Compatible with VFC, Elite Force GLOCK and Other Compatible Gas Blowback Airsoft Guns. Works in both pistols and rifles. Will not work for Glock GBB by Elite Force with KWC System, for VFC only