Integrated venting for gurgling-free flowAutomatic filling stop: prevents contents from overflowing and soilingWith union nut for precise positioning in small tank openingsCaptive screw capWith eyelet for attachment to the canisterOuter diameter of filler neck: 21 mmLength: 160 mmFor w = inner diameter of filler neck = 29 mmA specific fuel filling system is also available, item no. 6011-X1-0536