Frank; this set up in question has nothing to do with the PVC. It is a large nipple (1/2") that is located under the air horn of the air cleaner. When I position the cleaner correctly on the carb it is in line with the vent tube for the engine. The vent tube normally points down to just puke out blow by. But the side cover on this engine, there are two located on the passenger side w/ two nuts each, has a 1/2" tube that points up. It must have some sort of hose connecting the air cleaner to this vent. There is no nipple off the side of the housing like all the other cleaners have.......Russ ____________________________________________________ Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs