Hexagonal shaped jet with no letters stamped on the side for gasoline (petrol if you are a Brit), for all non-International MSR WhisperLite stoves.
Part Number: 419425.
If your stove came with a K Jet then it is an International and this is not the jet you need (if it has wire legs you need the IG Jet 419607 and if it has pressed steel legs then you need the UG Jet 07379).
Shaker Needle not included.