Review on Dorman 42344 PCV Valve Grommet for Compatible Vehicle Models by Justin Castro

Perfect fit front and rear. Recently both CCV knees had to be replaced, not PCV. If you're replacing knees on a Jeep 4.0L, do a little research and make sure you pick the right ones. Flow is critical on some 4.0Ls as some use a CCV system. See diagram below. You need a low flow elbow on the back of the valve cover and a high flow elbow on the front. Just make sure you get the right ones for your engine. The socket itself was well made and easy to assemble. Getting the old ones out isn't easy. It helps when it's a warm day or a warm engine. Nevertheless, they sit very well and firmly. Front Elbow http://www.amazon.com/gp/product/B000JZIXIW Rear Elbow (Revane said it wouldn't fit my 2000 Cherokee but they were wrong) http://www.amazon. com/gp/product/B000JZI1U2/