ASA Aquarium Suction Cup for Air & CO2 Tubes - Secure Underwater Tube Holder for Fish Tanks, Ponds & Hydroponics (Set of 10)

Single mini suction cup for aquarium use. Suits attaching CO2 diffusers and standard airline to your aquarium wall.

Hint: to soften them for easier attachment, soak in a container of warm water for 5-10 minutes.