For use in connecting NPT pipe to schedule 40 PE flexible tubing in a straight run Barbed fitting creates a tight seal on flexible tubing when used with a hose clamp (sold separately) Maximum working temperature of 140 degrees F PVC for strength and resistance to reactions with acids, gasoline, alcohol, and hydrocarbons Meets ASTM D2609 standards for plastic insert fittings and NSF 61 certified for use with potable water The Spears 1436 is a series of PVC tube fittings that function as adapters. They are typically used to connect pipes of dissimilar materials or create a transition from a piped system to a hose. Here's a detailed description. Made of Gray PVC plastic. It features two ends. One end has a male National Pipe Thread (NPT) thread for connection to threaded pipes. The other end has a barbed insert designed to grip onto flexible polyethylene (PE) pipe. It Connects PE pipe to threaded pipes. Used in potable water applications (NSF 61 certified). Works with fluids, drain, waste, and vent systems. Spears 1436 barbed adapters are known for their quality and ease of use. They are a popular choice for plumbing applications in residential and commercial settings.