1、2.25 Inch Internal Diameter Threaded Ferrule: This pool pump hose adapter comes with a 2.25 inch internal diameter threaded ferrule for attaching an NPT hose connector to a clamp on hose, as well as an O ring for a more watertight connection. 2、Good Compatibility: This hose conversion adapter set is a good fit for 4000, 2500, 2000, and 1500 GPH filter pumps, and whenever they require a threaded hose connection, this replacement hose adapter fits these filter pump sizes, providing a safe and reliable connection. 3、Excellent PVC Material: This pool pump hose connector set is made of excellent PVC material, which is sturdy and abrasion resistant, not easy to be damaged, and has a long service life. 4、Wide Application: This pool hose adapter set has a wide range of applications for generators and salt systems, these hose adapters are also standard sizes for generators or feeders and salt cell systems, allowing you to use your existing hose without having to purchase a larger hose for the pump. 5、Easy To Install: This hose conversion adapters kit is easy to install, you just need to install and fix it directly without complicated operatings and tools for pools with 1.5 and 1.25 inch hoses.