<https://aquariumfishonline.com.au/product/pond-one-02-plus-4000-air-pump/#product>
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"Pond One O2 Plus 4000 Air Pump\r\n\r\nO2 Plus Air Blowers from Pond One are specifically designed for outdoor use and are resistant to the perils that extreme weather can throw at them. Fitted with a 10m cable, installation is made simple in comparison to other models around.\r\n\r\nO2 Plus 4000 air machines are extremely powerful units. With an output of 35 litres per minute these are suitable for seriously large ponds or filters to stimulate aerobic activity or simply to add more oxygen to multiple points around the pond. They are also great for the fish keeper with many fish tanks or fish breeding rooms. With the design based upon the Aqua One indoor units, quietness is a given. Outlet size is 1/2 inch.\r\n\r\nEach unit comes with a 10 gang splitter allowing multiple air stones to be run simultaneously. The diaphragms of these pumps are Japanese silicone rubber cartridges which offer excellent reliability and life expectancy.\r\n\r\nFeatures &amp;amp; Benefits:\r\n\r\n \tHigh volume, high pressure pond air pump\r\n \tHigh grade long life silicone parts\r\n \tTwin air filters supply clean air to the pond by removing dust and pollution\r\n \tAids in circulation of dead water spot\r\n \t10m outdoor rated cable"
<https://aquariumfishonline.com.au/product/pond-one-02-plus-4000-air-pump/>