# Car seat adapters for twin and double strollers Which car seat adapters work with twin or double strollers? joovy Twin Roo\+ Maxi Cosi/Cybex Carseat Adapter: The store data describes the TwinRoo\+ as a frame stroller for two infant car seats that works differently from other twin frame strollers, and says the adapter fits Maxi Cosi/Cybex car seats\. Users say the kit includes adapters for two car seats at once\. Joovy lists this as a TwinRoo\+ adapter fitting Maxi Cosi and Cybex seats; this disagrees with the review's claim that it accepts only Maxi\-Cosi seats\. Mountain Buggy Nano Duo Twin Car Seat Adapter: The adaptor is intended for use on the Mountain Buggy Nano Duo only\. The adaptor takes two car seats at once, one on each side\. Compatible car seats listed by the maker are Mountain Buggy protect, phil&teds alpha, Maxi\-Cosi Cabriofix / Pebble Plus / Mico, Peg Perego Primo Viaggio 4\-35 and Primo Viaggio 30/30, Cybex Aton / Aton 2 / Aton Q, Nuna Pipa, Graco Snugride 35 and Snugride Clickconnect 35, and Chicco Keyfit\. Valco Baby Ultra Duo S2 Car Seat Adapters: The adapters are made for the Ultra Duo S2 stroller\. megababiesusa\-com says the Twin Adapter Kit includes one Maxi\-Cosi/Nuna/Cybex adapter and one Universal adapter, and that two of the same won't work; bambibaby\-com and strolleria\-com say the Twin Adapter Kit includes two Universal adapters\. The Maxi\-Cosi/Nuna/Cybex Adapter is compatible with most US models of these brands\. Baby Monsters Car Seat Adapter: Fits Easy\-Twin 2\.0, 3\.0 and 3\.0S strollers\. Both the Right\-Upper and Lower\-Left adapters are required to fit two car seats on the chassis\. The adapter is only for Maxi Cosi and Cybex car seats\. Valco Baby Ark Car Seat Adapters \(A0325\) / Ark Multi Seat Car Seat Adapters, Joey Seat Adapter \(A0326\): The adapters let an Ark stroller carry one or two car seats, for an infant and toddler or twins\. The Ark accepts car seats and can take one or two adapters\. A0325 is the Ark car\-seat adaptor for compatible Maxi\-Cosi, Nuna, Cybex and Clek car seats\. ### 1. [joovy Twin Roo\+ Maxi Cosi/Cybex Carseat Adapter](/products/ucp/joovy-com/8695988420836) (sold by joovy\.com) The store data describes the TwinRoo\+ as a frame stroller for two infant car seats that works differently from other twin frame strollers, and says the adapter fits Maxi Cosi/Cybex car seats\. - Stroller fit: The store data describes the TwinRoo\+ as a frame stroller for two infant car seats that works differently from other twin frame strollers, and says the adapter fits Maxi Cosi/Cybex car seats\. (listing) - Two seats: Users say the kit includes adapters for two car seats at once\. (review) - Car seat brands: Joovy lists this as a TwinRoo\+ adapter fitting Maxi Cosi and Cybex seats; this disagrees with the review's claim that it accepts only Maxi\-Cosi seats\. (guide) - Warranty: Every Joovy product carries a 90\-day limited warranty from the date of purchase, with the sales receipt as proof of purchase\. (guide) ### 2. [Mountain Buggy Nano Duo Twin Car Seat Adapter](/products/ucp/megababiesusa-com/7438517993726) (sold by megababiesusa\.com) The adaptor takes two car seats at once, one on each side\. - Stroller fit: The adaptor is intended for use on the Mountain Buggy Nano Duo only\. (guide) - Two seats: The adaptor takes two car seats at once, one on each side\. (guide) - Car seat brands: Compatible car seats listed by the maker are Mountain Buggy protect, phil&teds alpha, Maxi\-Cosi Cabriofix / Pebble Plus / Mico, Peg Perego Primo Viaggio 4\-35 and Primo Viaggio 30/30, Cybex Aton / Aton 2 / Aton Q, Nuna Pipa, Graco Snugride 35 and Snugride Clickconnect 35, and Chicco Keyfit\. (guide) - Warranty: - ### 3. [Valco Baby Ultra Duo S2 Car Seat Adapters](/products/ucp/megababiesusa-com/9415117340926) (sold by megababiesusa\.com) The adapters are made for the Ultra Duo S2 stroller\. - Stroller fit: The adapters are made for the Ultra Duo S2 stroller\. (listing) - Two seats: megababiesusa\-com says the Twin Adapter Kit includes one Maxi\-Cosi/Nuna/Cybex adapter and one Universal adapter, and that two of the same won't work; bambibaby\-com and strolleria\-com say the Twin Adapter Kit includes two Universal adapters\. (listing) - Car seat brands: The Maxi\-Cosi/Nuna/Cybex Adapter is compatible with most US models of these brands\. (listing) - Warranty: - ### 4. [Baby Monsters Car Seat Adapter](/products/ucp/megababiesusa-com/856678629437) (sold by megababiesusa\.com) Both the Right\-Upper and Lower\-Left adapters are required to fit two car seats on the chassis\. - Stroller fit: Fits Easy\-Twin 2\.0, 3\.0 and 3\.0S strollers\. (guide) - Two seats: Both the Right\-Upper and Lower\-Left adapters are required to fit two car seats on the chassis\. (guide) - Car seat brands: The adapter is only for Maxi Cosi and Cybex car seats\. (guide) - Warranty: Baby Monsters' catalog states a 4\-year warranty; conditions apply\. (manual) ### 5. [Valco Baby Ark Car Seat Adapters \(A0325\) / Ark Multi Seat Car Seat Adapters, Joey Seat Adapter \(A0326\)](/products/ucp/megababiesusa-com/9000234483966) (sold by megababiesusa\.com) The Ark accepts car seats and can take one or two adapters\. - Stroller fit: The adapters let an Ark stroller carry one or two car seats, for an infant and toddler or twins\. (guide) - Two seats: The Ark accepts car seats and can take one or two adapters\. (guide) - Car seat brands: A0325 is the Ark car\-seat adaptor for compatible Maxi\-Cosi, Nuna, Cybex and Clek car seats\. (guide) - Warranty: - Every value in the table is a fact RoboTrunk checked, linked to the page it came from\. A dash means no checked fact fills that cell\. Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live\. Written 2026-10-26T11:03:39.694Z. This page is published by RoboTrunk, a store built for shopping agents. The store named on this page sells the product and ships it. RoboTrunk is not the seller and never holds the money. Buying works in one path. RoboTrunk's tools prepare a checkout at that store, then hand back a short-lived link. 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