AJJ (formerly Andrew Jackson Jihad) apparently recorded a cover of Pup's song "Reservoir" a year and a half ago. They have just released the song, which you can listen to below. AJJ released Christmas Island in 2014 on Side One Dummy Records.
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PUP finish tracking new LP
Against Me!, Murder By Death and more to play Three Stacks Music Festival
PUP working on new record
Pup perform on 'The Chris Gethard Show'
PUP to perform on 'The Chris Gethard Show'
Pup featured on 'Last Call With Carson Daly'
PUP to appear on 'Last Call with Carson Daly'
PUP: "Old Wounds"
The Menzingers/PUP/Cayetana (EU and UK)