E&C (East Crane) knocker valve, for the Gab Blow Back Pistol magazines. Genuine OEM replacement Knocker Valve, for your E&C Gas Pistol magazines. E&C Knocker Valve for Gas Blow Back Magazines Features: Metal construction High grade silicone O-Rings Direct OEM Replacement part, made by E&C (East Crane). Compatible with: E&C Glock Series Magazine, Click here to view. The magazines in this range of E&C Gel Blaster Pistols, Click here to view.
