OASE OptiMax 4000 Asynchronous Submersible Pump is a OASE-branded product in the ownkoi catalog. High-efficiency asynchronous submersible pump from OASE. Manufacturer documentation cites 1,030 GPH at 70 watts of power draw. Specifications and pricing reflect the manufacturer-published or retailer-published data at the most recent catalog refresh. Verify the live listing on the source retailer page before purchase.