If you are looking for manufacturers or suppliers of diving aquarium pumps, here are some companies that may offer such products. Please note that as supplier information may change at different times and locations, it is recommended that you contact these companies to obtain the latest information and product availability.

Tsurumi Pump: Tsurumi Pump is headquartered in Japan and is a leading global pump manufacturer providing various types of pumps, including those used in diving aquariums.

Grundfos: Grundfos is a renowned Danish water pump manufacturer that provides efficient and reliable water pump solutions, possibly including submersible pumps for aquariums.

Ebara (Jiangyuan): Ebara is a global engineering and manufacturing company in Japan that manufactures various types of water pumps, possibly including those suitable for diving aquariums.

KSB Group (Karlsbaud): KSB Group is headquartered in Germany and is a leading global manufacturer of water pumps and valves, providing a wide range of water pump products.

OASE: OASE is a German company specializing in the manufacturing of water features and aquarium equipment. They may provide related products for diving aquariums, including water pumps.

AquaEuroUSA: AquaEuroUSA is an American company specializing in aquariums and aquarium equipment, and they may provide the water pumps required for diving aquariums.

Zhongshan Sea Billion Electrical Appliance Co., Ltd.A professional manufacturer of producing aquarium equipment, lamp, pet appliance, gardening equipment with more than 10 years' experience on lamp supplies and aquarium equipment manufacturing. Constantly learn and absord the advanced foreign technology and crafting in strict accordance with ISO9001 Quality Management System and assure the product quality with scientific and rigorous management philosophy with the integration of development and production. 

Reef Octopus: Reef Octopus is a company that specializes in manufacturing seawater aquarium equipment and may provide pumps for diving aquariums.

Please note that these companies may have multiple models and specifications of water pumps to choose from, depending on your aquarium needs and system requirements. Before purchasing a water pump, it is recommended to contact the manufacturer to understand their product line and ensure that the selected water pump is suitable for your specific application. In addition, it is also necessary to consider the performance, durability, and maintenance requirements of the water pump.