Check valves prevent the reverse flow of water. This spring-loaded 1 in. Push-to-Connect Check Valve can be installed horizontally or vertically, and should be installed on the tubing per the arrow on the side of the check valve indicating the direction of the water flow. QUICKFITTING's patented technologies offer a full range of high-quality plumbing fittings and valves that are quick and easy to install. Our push-on fittings are reusable, durable, permanent plumbing connections, and get the job done 90% faster than traditional methods, including soldering. Our quick connection technology provides a simpler, safer, and a more cost-effective solution for connecting Copper, PEX and CPVC piping in plumbing and heating applications. No open flames or sealants needed, just quickly clean and debur the end of the pipe, then push to connect the fitting. We raise the industry bar for push connect technology by continuing to develop and test our products to provide superior performance. Removal of our push fittings is effortless with our patented Slip Clip release tool. QUICKFITTING is a US-based company with a portfolio of over 100 patents and counting, and our products are backed by a 75-year warranty. Material: Brass.