Integrated venting ensures gurgling-free flow Automatic filling stop: prevents contents from overflowing and soiling With union nut for precise positioning in small tank openings Captive screw cap With eyelet for attachment to the canister Outer diameter of filler neck: 21 mm Length: 160 mm For w = inner diameter of filling opening = 29 mm A specific filling system for chain oil is also available, item no. 6011-X1-0537