These printers use the DR221BK cartridge:

Brother DCP 9020 CDW

Brother HL 3140 CW

Brother HL 3150 CDN

Brother HL 3150 CDW

Brother HL 3170 CDW

Brother HL 3180 CDW

Brother MFC 9130 CW

Brother MFC 9140 CDN

Brother MFC 9142 CDN

Brother MFC 9330 CDW

Brother MFC 9340 CDW