Refill unit having a container

A refill unit, comprising:

• a container having a neck for storing a liquid or pasty media and having air being admitted into said container, said container being provided for upended arrangement in a dispenser, said neck having at least one lower circumferential rib, at least one upper circumferential rib and an end side with a recess defining a mouth opening formed therein, said upper and lower circumferential ribs having recesses formed therein and with said recess on said end side of said neck leave free an air path into said container;
• a metering pump attached to said neck and having a dispensing opening formed therein;
• a first non-return valve disposed at a transition from said neck into said metering pump;
• a second non-return valve disposed at said dispensing opening of said metering pump;
• and
• said metering pump having a first part and containing said first non-return valve, and engaging around said at least one lower circumferential rib of said neck, said first part having an annular lip butting against an inside of said neck, said metering pump having a second part containing said second non-return valve, encloses a delivery chamber, extends over said first part and engages around said at least one upper circumferential rib of said neck, said mouth opening being covered by said annular lip of said first part.