Coast / Wave Tandem Car Seat Adaptors Transform your Silver Cross Coast / Wave pram into a tandem with the use of these tandem adaptors. Connect a Simplicity or Dream car seat to your Silver Cross Coast / Wave Pushchair with these convenient adapters. Compatible with Silver Cross Simplicity and Dream car seats, they’re easily fixed into the tandem position of your Wave or Coast pushchair chassis. Then just slot the seat in and you’re ready for adventures, whether it’s nipping off to the shops or heading on a big day out with friends. Safe and secure, they’re perfect for families with twins or two little ones close together.