A fitting is used to connect different size tubes to one another. We offer you a wide range of fittings so that you're able to find the one that works perfectly with whatever you're working with. The fittings we have in stock include connectors and valves. The connectors we carry work with a variety of products, but specifically they work with faucets and garden hoses. The valves that we carry include ones that you can shut off to stop the flow.