Filler neck for an auxiliary liquid reservoir

A filler neck for a liquid reservoir for a motor vehicle comprising:

• a neck housing including a mouth hole stub having a mouth hole for a filler nozzle and a filling channel leading into the reservoir,
• wherein a receiving structure for a filler nozzle is provided within the neck housing,
• wherein at least one venting path is provided within the neck housing,
• wherein the venting path allows a venting flow parallel and counter to the refilling volume to flow through the neck housing and through the mouth hole during refilling to atmosphere when the filler nozzle occupies the mouth hole,
• wherein the mouth hole of the mouth hole stub is defined by a mouth hole wall which is profiled such that the mouth hole wall defines at least one gas outlet channel to the atmosphere when the filler nozzle is inserted in the mouth hole of the mouth hole stub,
• wherein the mouth hole wall defines at least one groove profile extending in a filling direction from a first terminal end of the mouth hole stub to a second terminal end of the mouth hole stub such that the at least one groove extends along an entire length of the mouth hole from the first terminal end to the second terminal end of the mouth hole stub, and
• wherein the first terminal end of the mouth hole stub including the at least one groove profile defines an entrance into the filler neck at a terminal end of the filler neck.