They are design with a snap-on lid that, once closed, cannot be removed. The unique D.I.S.S. connection allows for direct connection to the regulator. The new improved self-sealing filter increases flow by 20% over float types an deliminates back flow that damages the suction regulator and system. These come with a standard stem or screw (DISS) lid or with Tubing or Tubing and Solidifier attached to the lid. Suction Canisters with Tubing & SafeSorb Solidifier 1500cc, Stem Lid, connects to Suction Regulator by short Connecting Tubing.