The Spears 1435 series tube fitting is made of gray polyvinyl chloride (PVC) plastic and connects schedule 40 polyethelene (PE) pipe to threaded pipe conforming to the National Pipe Thread (NPT) standard. This adapter has a barbed fitting on one end to create a tight seal on flexible PE pipe when used with a hose clamp (sold separately), and a female NPT connector on the other end connects to threaded pipe. PVC is corrosion resistant, and has high strength. It resists reactions with acids, gasoline, alcohol, and hydrocarbons. The fitting meets D 2609 standards set by ASTM International for plastic insert fittings for use with PE pipe, as well as ASTM schedule 40 standards for wall thickness to support working pressure to 140 psi. It is certified by NSF International for use with potable water. Pipe fittings are components used for connecting, terminating, controlling flow, and changing the direction of piping in many different industries. 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). Spears Manufacturing produces thermoplastic fittings and valves for fluid, drain, waste, and vent systems. The company, founded in 1969 and headquartered in Sylmar, CA, meets International Organization for Standardization (ISO) standard 9001.