The Baby Jogger Car Seat Adaptor allows you to turn your City Select or City Versa stroller into a travel system by providing a place to securely attach your Britax B-Safe car seat to the stroller until your baby can sit in the upright seat. Compatible only with the City Select and City Versa. (City Select Users: To configure for two car seats, the second seat for the stroller or a set of second seat adaptor brackets must be purchased in advance as these brackets are required to support the second car seat.) Legal Statements: This and all items from Baby Jogger are excluded from all promotions and discounts except where otherwise noted on product detail pages.