The XDP intercooler Adapter O-Ring Seal XDP (Fits XD305/XD364/XD458) is a high-quality replacement for the leaking O-ring on the intercooler pipe in your 2011-2023 Ford 6.7L Powerstroke. This O-ring is made of Buna-N Rubber which is durable material designed to resist oil, water, and other chemicals. The round profile of this O-ring helps to ensure a long service life against compression and tearing while keeping its shape.