Chihiros CO2 Diffuser Mate Size M – CO2 Diffuser Holder for AquariumsThe Chihiros CO2 Diffuser Mate Size M is a mounting holder for Size M glass CO2 diffusers in planted aquariums. It attaches to the aquarium glass via suction cup, keeping the diffuser firmly in position for consistent CO2 delivery. Compatible with most standard Size M glass CO2 diffusers. Key features Secure suction cup mounting for Size M glass diffusers Prevents diffuser movement during CO2 injection Compatible with most standard Size M glass CO2