This is the correct Nylon F-fitting with the OEM markings and part number.The quality is excellent. There are a pair of 5/16" posts threaded into the intake between the center and rear carbs. Hoses attach to this fitting. The fitting points to the passenger side. Another 3/8" hose runs to the PCV valve in the valley pan. Also have one other F-fitting available that is metal in the shopping cart. It is a heavy duty metal F-fitting for $26.00 that is of excellent quality. Also have a kit on the page to replace the rubber hose going to the F-fitting and PVC valve.