THREADED TO CLAMP STYLE HOSE ADAPTER - These adapters come with 2.25-inch interior diameter threaded collars to connect NPT hose connectors to clamp style hoses. They are perfect for aftermarket or old hoses that do not have adapters. The adapters also have O-rings for a more watertight connection. FITS INTEX POOL SETS WITH 1.5 AND 1.25-INCH HOSES - If you are planning to install an Intex sand filter, this is the perfect hose adapter, as these pumps often come with 1.25-inch diameter hoses. The most common use for these adapters is to connect Intex male threaded connectors to clamp-style hoses. FITS 4000, 2500, 2000, AND 1500 GPH FILTER PUMPS - This replacement hose adapter is a universal fit for these filter pump sizes as long as they require a threaded hose connection. You can’t get wrong with hose adapters that provide secure and reliable connections. FITS CHLORINE GENERATORS AND SALT SYSTEMS - These hose adapters are also the standard size for chlorine generators/feeders and salt