Reaction vessel lid is constructed of 1/4"; thick #316 S.S. with a 1/8"; thick PTFE gasket underneath. The only material exposed to the reaction is PTFE. Lid has seven openings that accept 45/50 outer PTFE inserts. One neck is a bulk addition port is 80mm reaction flange with o-ring groove. Inserts are secured to the lid using glass filed PTFE nuts. Lid can be used on any of our CG-1968-W style reactors. The flat design reduces the height over the standard glass reaction vessel lids.