This answer is for the Bugaboo Fox (earlier generations), though one maker didn't say which version. Not sure which Fox you have?
Key specs
Adapter
price not listed
Seat rated to
32 lb, 32 in
On planes (FAA)
Yes
Good to know before you click it on
Manual names 'Bugaboo Fox' with no generation; remove the adapter and infant carrier before folding.
About this pair
The Nuna Pipa Lite goes on the Bugaboo Fox (earlier generations) with the Nuna PIPA adapter for Bugaboo Fox. The seat itself is rated up to 32 lb and up to 32 in, per Nuna.
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2 other infant seats fit the Bugaboo Fox (earlier generations).
Summary from the makers' published data.
How to set up the Nuna Pipa Lite on the Bugaboo Fox (earlier generations)
What you need
The Bugaboo Fox (earlier generations)
The Nuna Pipa Lite carrier (its car base stays in the car)
The Nuna PIPA adapter for Bugaboo Fox
Step by step
1Slide the two halves of the adapter together until they click, then pull on both ends to check the join.
2Set the adapter onto the stroller's seat mounts and press until it clicks.
3Place the PIPA car seat on the adapter and press down until it clicks.
4Pull up on the car seat to check it is locked to the adapter and the adapter is locked to the stroller.