Narrow Your Results By: Polypropylene fittings are generally acceptable for working pressures up to 150 PSI at normal room temperatures. At higher temperatures, the recommended working pressure decreases. For example, at 140°F the maximum recommended working pressure is 90 PSI.
Polypropylene (PP) is the lightest weight piping material with very good chemical resistance, even to many organic solvents. It is used extensively for HVAC applications and is available in two classifications, with Type I being the most common.