CB Engineering 2005 2006 Jeep Liberty 2.8l CRD Turbo Diesel CCV Plug for the R428 engine. The 2.8L CRD CCV Plug is machined from 6061 aluminum. This CCV plug allows you to block off the CCV port on the intake tube. This kit is designed for the 2005 2006 Jeep Liberty 2.8L CRD vehicles running the R428 engine. This is usually an in stock item, but can have a lead time up to 2 weeks.