This is the OS Super 203 Air Cleaner Assembly. Works on the OS 20L carb for the OS .21VZ-B (P) engine. Works on the .18 OS Engines as well FEATURES: Complete Super Air Cleaner Assembly with pre-oiled foam filters YOU WILL RECEIVE: One rubber intake elbow _ Two rubber o-ring One black plastic element base Two filter elements, OSMG2393 One plastic end plate (lid) One flanged retaining cap screw Instructions REQUIREMENTS: Assembly dew11-11-03 ir/jxs updated 032405 tjt added OS .18 info &