Use in low-pressure applications under 300 psi.

Use in medium-pressure applications up to 1,000 psi.

Weld fittings to pipe for a permanent connection. Welded connections are stronger than threaded connections and are less likely to leak.

Iron and steel are more economical than stainless steel. They are compatible and can be used interchangeably.

Plastic pipe and pipe fittings are lighter in weight than metal pipe and pipe fittings. They are typically for low- to medium-pressure applications up to 1,000 psi.