Premium Materials: These pool hose adapters are made of high quality plastic, which is wear-resistant and solid, not easily deformed and broken, rusty and can last for a long time, which makes it the best partner for swimming pools. Pool adapter A: If you only have a 1.25" hose adapter for pumps, but want to install a 1.5 piston valve " or upgrade a more powerful filter pump, this pool adapter is the perfect solution. Applicable diameter: pool hose adapters can be used alternatively to spiral hoses, suitable for connecting pool hoses, for 38mm pool hoses and 32mm pool hoses with 2" external thread, such as standard filter systems. Specifications: Pool hose adapters suitable for all filter pumps of 4000, 2500, 2000 and 1500 gallons/hour with threaded hose connections, please check specifications before purchasing. Wide range of applications: Pool A adapters are suitable for system hoses filters, submersible pumps, swimming pool pumps, filtration pumps, sand filters or shut-off valves. We recommend using hose clamps in the area where the water line touches the socket.