The Bestway Hose Adaptor is a simple and effective way to give smaller Bestway pools larger pumping power by enabling more powerful filter pumps to connect to 8ft to 12ft pools, improving the flow of clean water. Two hose adaptors are included to fit onto an inlet and outlet hose. Each hose connector transforms the end of a 11/2 inch hose into a 11/4 inch connection. Small above ground pools have a 11/4" inlet and outlet whereas the most powerful filter pumps are compatible with 11/2" hoses. By using the swimming pool hose connectors you"d be able to attach a 2,500 gallon per hour filter pump or even a 1,500gal Flow clear Sand Filter Pump.