Aircraft Components Filler Neck

A metallic tubular item specifically designed for directing the flow of a fluid, and must accommodate the cap (as modified) or breather on one end. the opposite end has provisions for mounting directly on, or indirectly through a pipe, tube, or hose to an aircraft component. it may have means for overflow. for items which do not accommodate a breather or cap, see tube, pipe, or hose (as modified).