Converter Adapter: The swimming pool hose adapter is used for the salt water system of an above ground swimming pool. If you only have 1.25" hose but want to install a 1.5" piston valve or upgrade to a stronger filtration pump, Adapter A is the perfect solution. < br /> 【Compatible with】 Pair of A-Series Adapters, 25007. Compatible with all 4000, 2500, 2000 and 1500 gallon per hour filter pumps that use threaded hose fittings for Intex. < br />Premium Material: The swimming pool parts are made of premium plastic, sturdy and durable. The rubber ring is firmly connected to the 3.5cm pipe to form a sealed space to prevent water leakage. 【Easy to install】 A pipe adapters are designed for connecting 1.25 inch pipes with piston valves or filter pump. Small end attaches to 1.25" hose. Threaded end attaches to 1.5" piston valves or filter pumps - Simply screw in the filter. You don't have to no need to buy other sizes pipes, avoid extra costs. 【Pipe Connection】 Converts threaded pipes into 1.5 and 1.25 inch clamp pipes and pipes for Intex pool kits. Fits Intex chlorine generators and salt systems that use threaded fittings. These Type A adapters work closely with other pool faucets to keep your pool running safely and efficiently.