Precon Slot Dipping Device

This Type Of Hatch Is Used In Order To Prevent Vapor Loss Inside A Fuel Tank In The Process Of Measuring.This System Consists Of Two Parts ( Assembled Together) . The Upper Housing Takes A Sample Device Inside And The Upper Lid Is Closed. Then The Lower Housing Lid Opens And The Sample Device Is Dipped In To The Tank. Thus The System Is Completely Closed To Atmosphere