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The protective sleeve has a suitable gap design to protect the fish while keeping the heat generated by the heater. Our aquarium heater shield case is perfect to protect your fishes in tank from water heater scalding. There are six sections in total, with a length of 15-42 cm, an inner diameter of 2.6 cm and an outer diameter of 3 cm, detachable design makes it easier to break at the length you need. Long heating rods or short heating rods can be freely split and combined. It also has one more suction cup than other protective covers, and three suction cups are more reliable in adsorption! Suitable for fish tank heating rods with a diameter of less than 3 cm.