Features : Heavy duty aluminum construction with check poppet. The center of gravity is at the handle for ease of operation. Check poppet opens automatically when elbow is connected to fill adapter and close automatically when elbow is removed from adapter, this will prevent spillage while in use. Unique locking action that insure positive connection and uniform seal compression at fill adapter. 360° round sight glass window on top. 5° angled four bolt flange pattern with variety of different inlets to meet any requirement.