JACO polypropylene fittings have good chemical resistance and are unaffected by most weak acids and alkalies. Below 175°F they have good resistance to organic solvents. They should not be used with oxidants or strong acids or in continuous sunlight. The polypropylene used in JACO fittings is 20% glass filled for improved stiffness and is NSF listed.Advantages of JACO fittings over metal compression fittings: Good electrical insulating qualities. This eliminates the electrolytic action that corro