The pool hose adapter is used for saltwater system of above ground swimming pool. If you only have 1.25inch hose, but you want to install a 1.5inch plunger valve or upgrade to a stronger filter pump, the adapter A will be the perfect solution. A series adaptor pair, 25007.Fits all 4000, 2500, 2000 and 1500 gallon per hour filter pumps that use threaded hose connections for . The Hose Adapters A are designed for connecting 1.25inch hoses with plunger valves or filter pump. The small end attach to 1.25inch hose. The threaded end attach to 1.5inch plunger valves or filter pump, simply screw it on. You 't need to buy other size hoses, avoid extra costs. The swimming pool parts are made of high quality plastic materials, which is sturdy and durable.The rubber ring is tightly fitted with the 1.25inch hose to form a sealed space to prevent water leak. Colour:As Shown Material:plastic Package Contents: 1set * Hose Adapter kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.