Compatible with:Pair of A-series adapters,Hose adapter fits all 4000, 2500, 2000 and 1500 gallon per hour pool filter pumps that use threaded hose connections. High Quality Material:Pool Hose Adapter made of corrosion resistant plastic material, it is sturdy and durable, perfect for swimming pool kits. Converts adapter:Suitable for chlorine generators and salt systems that use fittings for threaded pipes. If you only have a 1.25" hose but want to install a 1.5" piston valve or upgrade to a more powerful filter pump, Adapter A is the perfect solution. Wide range: Suitable for hose for filter system, submersible pump, swimming pool pump, filter pump, sand filter system or shut-off valve. High quality set: 2 spare threaded fittings, 2 pads in rubber Swimming pool hose adapter, economical and practical, waterproof seal, effectively prevent water leakage.