Dresser Intervention Solutions sealing cups are used to seal off the inside of the pipeline during line stopping operations to prevent product flow-through.  LS-2 standard wall sealing cups are manufactured to work with LS-2 plugging equipment as well as existing similar equipment.  The LS-2 sealing cups come in sizes 2"-12" and series 60 and series 275. Sealing cups are available in rubber compound materials of BUNA-N, VITON and EPDM.