An encapsulated layer reduces thermal expansion by up to 75% compared to other plastic piping systems. The coefficient of linear expansion with PP-RCT is similar to copper piping systems. This mix of materials produces higher temperature and pressure ratings than the standard commercially available PPR products. ISCO PP-RCT is available in ½- through 24-inch diameters with standard 20-foot sections and is highly resistant to stress cracking and oxidative failure. Each system is joined by using a wide selection of socket, butt and electrofusion fittings.