Premium materials: these pool hose adapters are made of high quality plastic, wear-resistant and strong, not easy to deform or break, still rust and can last a long time, making them the best partner for swimming pools. Applicable diameter: pool hose adapters can be used alternatively to spiral hoses, suitable for connecting pool hoses, for 38 mm pool hoses and 32 mm pool hoses with 2 inch male threads, such as standard filter systems. Pool adapter A: If you only have a 1.25 inch pool hose connector, but install a 1.5 inch piston valve or upgrade to a more powerful filter pump, this pool adapter A is the perfect solution. Specifications: pool hose adapters are suitable for all filter pumps with 4000, 2500, 2000 and 1500 gallons/hour with threaded hose connections, please confirm the specifications before purchase. Wide range of applications: hose adapters are suitable for hoses of filter systems, submersible pumps, pool pumps, filter pumps, sand filter systems or shut-off valves. We recommend using hose clamps in the area where the water pipe meets the nozzle.