The 2 removable receivers are needed only on Alterrain / Alterrain Pro.
Never jog with an infant car seat attached; the store page lists 'From Birth with Infant Car Seat (walk only)'.
About this pair
The Britax Willow S goes on the BOB Revolution Flex 3.0 with the BOB Jogging stroller adapter for Britax ClickTight seats (model S943900), about $94.99. With the carrier on, you are pushing about 37.7 lb (28.5 lb stroller, 9.2 lb carrier). The seat itself is rated up to 30 lb and up to 32 in, per Britax.
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14 other infant seats fit the BOB Revolution Flex 3.0.
Summary from the makers' published data.
How to set up the Britax Willow S on the BOB Revolution Flex 3.0
What you need
The BOB Revolution Flex 3.0
The Britax Willow S carrier (its car base stays in the car)
The BOB Jogging stroller adapter for Britax ClickTight seats (model S943900)
Step by step
1Set the parking brake and rotate the canopy toward the handlebar.
2If the stroller has no built-in receivers, push the included R and L receivers onto the yellow pins behind the seat fabric until they click and green bars show.
3Push both end caps of the adapter straight into the receiver sockets until each side clicks, then pull the front tube to check it is locked.
4Recline the stroller seat and set the car seat on the adapter rear-facing and centered, lining up the car seat's side hooks with the receivers.
5Push the car seat straight down until both sides click.
6Lift up on each side of the car seat to check it is secure.
Britax says it needs an adapter (Jogging stroller adapter for Britax ClickTight seats).
“BRITAX WILLOW S ... ALTERRAIN / ALTERRAIN PRO / REVOLUTION Flex 2016+/2.0/3.0 / RAMBLER: USE WITH SINGLE JOGGING STROLLER ADAPTER FOR SELECT BRITAX INFANT CAR SEATS WITH CLICKTIGHT S943900”
