Brother HL-4040CN / 4050CDN / 4070CDW high capacity refill bottle
State-of-the-art toner to refill your cartridge. Yields the same as high capacity cartridges but can
be used to refill either high or low yield versions of the cartridge.
Tested on our own Brother HL-4040 printer in our own lab. In both high and standard capacity cartridges.
Free PDF refill instructions here