Flame Boss does not have an adapter for the Weber Summit grill. We do, however, have the following workaround:

Purchase our Flame Boss Guru Adapter, available on our website at https://www.shop.flameboss.com/product/flame-boss-guru-adapter/, and also purchase the BBQ Guru Weber adapter. https://www.bbqguru.com/StoreNav?CategoryId=&ProductId=6 

Our Flame Boss Guru Adapter inserts into the BBQ Guru Weber Summit adapter and permits our FB400-WiFi or FB500-WiFi Kamado blowers with square output to attach.

Please note: Flame Boss controllers are not recommended for use on Summit Series Kamado style grills with gas ignition or Weber Summit Series gas grills.

If you need further assistance, please click here to Contact Us or call us at 800-978-9078.