Helix Constant Torque Locking Screw with Seal to lock nebulizer to spray chamber and prevent leaking. The item consists of a constant torque locking screw and a PTFE PressFit ferrule. The item fits glass spray chambers of ICPMS and ICPE that are sealed with locking screw. The Helix CT Locking Screw with Seal is a new design and NOT backwards compatible with locking screw 046-00093-92 or Helix seal 046-00093-93. For ICPMS and ICPE.