Threaded to Clip-on Hose Adapters - These adapters have a 2.25" ID threaded collar for connecting NPT hose connectors to clip-on hoses. They are ideal for aftermarket or older hoses that do not have an adapter. The adapters also feature an O-ring for a more watertight connection. Suitable for INTEX pool kits with 1.5 and 1.25 inch hoses - the perfect hose adapter if you intend to install an Intex sand filter, as these pumps usually come with a 1.25 inch diameter hose. The most common use for these adapters is to connect Intex male connectors to clip-on hoses. Suitable for 4000, 2500, 2000 and 1500 GPH filter pumps - whenever a threaded hose connection is required, this replacement hose adapter can be universally adapted to these filter pump sizes. The hose adaptor provides a safe and secure connection without error. Suitable for chlorine generator and salt systems - These hose adapters are also standard sizes for chlorine generator/feeder and salt tank systems, allowing you to use your existing hose rather than buying a larger hose for your pump. US Customer Service - We are always at your service. Before you place your order, or even after you have received your product, please contact our customer service team in the USA for product-related questions. We are committed to providing you with the best possible shopping experience.