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While it appears as though the Primus Gravity Multifuel Kit should work with your varifuel stove, we recommend reaching out to Primus (1-800-443-4871) to make sure that the coupling between the hose on your stove and the pump are still compatible. They have made some changes to the fuel pump over the years since the Himalaya Varifuel Stove was in production, so you will want to make sure that coupling has not changed, or at least is still functional with the new pump style.
Additionally, it does not appear that an MSR pump will work with a Primus stove, however, it does look like you can interchange fuel bottles from each brand.
Hopefully this helps!
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