tube fittings are components used for connecting, terminating, controlling flow, and changing the direction of piping in many different industries. Push-to-connect compression fittings do not require tools or sealants, and are useful in installations where a heat source, such as a soldering torch, is prohibited. When purchasing pipe fittings, consider the application, as this will affect material type, shape, size, and required durability. Fittings are available threaded or unthreaded, in many shapes, styles, sizes, and schedules (pipe wall thickness). Our Stem Elbow Connector is suitable for use in hot(150°F Max) and cold (34°F Min.)water applications. It adopts Push-Fit technology, which allows users to connect and disconnect quick and easy without the need of any other tools.Operated by hand, it replace threaded or flanged connections, which require wrenches. It is used to branch off to different outlets for your RO unit.This connector fits standard OD 1/4" Copper, CPVC, PEX and PVC tubing for most RO systems.