Converter Adapter: The pool hose adapter is used for the saltwater system in an above-ground pool. If you only have a 1.25-inch hose but want to install a 1.5-inch plunger valve or upgrade to a more powerful filter pump, the A adapter is the perfect solution. [Compatible with] A pair of A-series adapters, 25007. Compatible with all 4000, 2500, 2000, and 1500 gallons per hour filter pumps that use threaded hose connections for Intex. Premium Material: The pool parts are made of high-quality plastic, sturdy and durable. The rubber ring is securely attached to the 1.5-inch hose to form a sealed space to prevent water leakage. [Easy to Install] The A hose adapters are designed to connect 1.25-inch hoses with plunger valves or a filter pump. The small end attaches to a 1.25-inch hose. The threaded end attaches to 1.5-inch plunger valves or filter pumps – simply screw onto the filter. You don't need to buy other hose sizes, saving you extra costs. [Hose Connection] Converts threaded hoses to 1.5-inch and 1.25-inch hoses for Intex pool kits. Fits Intex chlorinators and salt systems that use threaded connections. These Type A adapters work closely with other pool valves to keep your pool running safely and efficiently.