Intex Krystal Clear Cartridge Filter Pump for Above Ground Pools, 1000 GPH Pump Flow Rate, 110-120V with GFCI Easy to use - simply replace the old cartridge with a new one every two weeks, Double insulated pump The number on the actual item seen in the image is 637R, is the component part number that corresponds to the individual part for the system and this does not pertain to the model # 56637EG. Air release valve for air trapped inside filter chamber.we do not suggest operating the pump for more than 8 hours per day Sediment flush falve at bottom of filter chamber Works with 15-feet Easy Set, 15-feet Metal Frame, or 18-feet by 10-feet Oval Frame pools. the hoses are 1-1/4 so if you need 1-1/2 you need an adapter.