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https://www.swelluk.com:443/oase-optimax-800-5000-aquarium-pumps/ 
Oase OptiMax 800-5000 Aquarium Pumps
The powerful Oase OptiMax pumps are small powerhouses for water displacement in underwater implementation. All pumps are energy-efficient, have an adjustable water flow rate and are equipped with suction holders for fastening. The variants 800 to 5000 can be set-up dry. All models are suitable for both fresh water and salt water.
Products
Product Information
The OptiMax aquarium pumps are made to the usual highest standard that the Oase brand is known for. Available in various sizes, these energy-efficient pumps feature adjustable water flow rate and include suction cups for easy positioning with the tank.
Model 800 - Dimensions = 78 x 52 x 88mm, 800L per hour and has a max head height of 1m.
Model 1000 - Dimensions = 78 x 52 x 88mm, 1000L per hour and has a max head height of 1.3m.
Model 2000 - Dimensions = 140 x 135 x 94mm, 2000L per hour and has a max head height of 2.4m.
Model 3000 - Dimensions = 140 x 135 x 94mm, 2800L per hour and has a max head height of 3.0m.
Model 4000 - Dimensions = 140 x 135 x 94mm, 4400L per hour and has a max head height of 3.0m.
Model 5000 - Dimensions = 140 x 135 x 94mm, 5000L per hour and has a max head height of 3.0m.
All Oase OptiMax pumps come complete with a 3 year guarantee.