MultifunctionalThis pool hose adapter is used for saltwater system of above ground swimming pool. If you only have 1.25" hose, but you want to install a 1.5" plunger valve or upgrade to a stronger filter pump, the adapter A will be the perfect solution. Easy InstallationThe Hose Adapters A are designed for connecting 1.25" hoses with plunger valves or filter pump. The small end attach to 1.25" hose. The threaded end attach to 1.5" plunger valves or filter pump, simply screw it on. You don't need to buy other size hoses, avoid extra costs. CompatibleFits all 4000, 2500, 2000 and 1500 gallon per hour filter pumps that use threaded hose connections. DurableThe swimming pool parts are made of high quality plastic materials, which is sturdy and durable, have a long service life. Prevent Water LeakThe rubber ring is tightly fitted with the 1.25" hose to form a sealed space to prevent water leak.