Aquarium suction cups are used to attach thermometers, filters, hoses, heaters, and other devices to the glass. As long as the water in the aquarium is not too hard and its pH does not exceed the norm, the suction cups hold the equipment perfectly. When gathering equipment for the aquarium, it's worth having a set of universal suction cups on hand, which will serve their purpose regardless of the type of attached equipment. The only thing we need to pay attention to is their diameter. Universal suction cups organize our work and space in the aquarium according to our own preferences and convenience. Their flexible design allows for easy installation and removal whenever we want. The possibility of purchasing spare parts for aquarium equipment saves time and money, as losing one element does not mean we have to give up using the entire equipment.