HAM-LET Needle Valves with Rupture discs were designed to be mounted on HAM-LET sample cylinders, the Ruptur e disc provides protection against over pressure in sampling units by venting the media to the atmosphere. The Rupture disc element is welded to a carrier that is assembled to the Valve with an O-Ring seal. A Ruptur e Disc unit can be easily replaced in the field while the valve r emains connected to the sampling unit.