Hot Side: Fluorocarbon Lined Charge Air Connectors (CAC). 4-Ply Silicone coated meta-aramid fabric with stainless steel pressure retention rings. High temperature fluorocarbon elastomeric liner. Temperature range is -65°F (-54°C) to +500°F (+260°C). Designed to meet the EPA 2007 and EURO IV & V requirements for reduced emissions. Used on diesel truck engines to deliver pressurized intake air to the charger air inter cooler and intake manifold. Fluorocarbon lining eliminates closed crankcase vapors from permeating through the side wall if the inter cooler connection bellows at 500°F (260°C).