F2159 and F1960 are ASTM (American Society for Testing and Materials) standards that specify different methods for making connections in PEX (cross-linked polyethylene) tubing systems. These standards are commonly used in plumbing and heating applications with PEX tubing, and they can be applied to both PEX-A and PEX-B tubing, as well as other PEX types.

  1. F2159 - This ASTM standard outlines the method for making PEX-to-PEX connections using compression-style PEX fittings. These fittings typically have an O-ring or a similar sealing mechanism that is compressed when the fitting is installed. This standard is applicable to both PEX-A and PEX-B tubing.
  2. F1960 - This ASTM standard specifies the method for making PEX-to-PEX connections using expansion-style PEX fittings. Expansion fittings require a special tool (expander) to enlarge the PEX tubing, allowing the fitting to slide inside the expanded end. When the tubing contracts back to its original size, it creates a secure and watertight connection. This standard is also applicable to both PEX-A and PEX-B tubing.

In summary, both F2159 and F1960 standards can be used with both PEX-A and PEX-B tubing for making different types of connections in plumbing and heating systems. The choice between these standards may depend on factors such as the type of fittings you prefer to use or the specific requirements of your project.