The Plug and Go tire repair kit uses some unique mushroom shaped plugs. After two failures to get the plug to press through the nozzle I lubed the third one up with some Pam cooking spray and it went in easily. The mushroom plugs have some sort of lubricant on them, in the packaging. But apparently insufficient. If your kit doesn't have a small bottle of light oil I suggest adding something. On the otherhand, don't forget the oil dip stick will get the necessary drops of oil to do the trick.