The Encase polypropylene system features electrofusion fitting with a groundbreaking heavy-gauge resistance wire molded into the socket. It uses the same material inside and out, which eliminates differential expansion problems and ensures that chemical resistance is the same for the entire system. The Encase acid waste polypropylene end seal socket x spigot offers excellent chemical resistance and the ability to handle a wide temperature range. It is available in 1-1/2, 4"; 2, 4"; 3, 6"; 4, 8", 6, 10" and 8, 12" sizes.