Drain sealing apparatus

A drain lock sealing apparatus for being positioned in a drain pipe below a surface mounted grate in a room area, the drain pipe having an interior surface, the drain lock sealing apparatus comprising:

• A grate for positioning over the drain pipe;
• A cylindrical sealing ring defining a cylindrical space through which liquid flows into the drain, the cylindrical sealing ring coupled to the grate for projecting into the drainpipe, the sealing ring being resiliently deformable and having an outer surface positioned adjacent the interior surface of the drain pipe;
• An expander member have a cylindrical outer body with a first end position facing the grate, a second end with a circumferential edge facing into the drain pipe, the expander member having an outer cylindrical surface tapered inwardly from the second end to the first end, the first end being inserted in the cylindrical space of the cylindrical sealing ring, the expander member having a center hub with an axial hole therethrough, the axial hole having bolt receiving thread therein;
• A resiliently deformable closure member having a central region and a peripheral closure edge, the central region affixed to the center hub of the expander member with the peripheral closure edge positioned against the circumferential edge of the expander member in non-fixed, normally closed relationship, the peripheral closure edge opening in response to liquid passing through the grate into the drain and resuming the normally close relationship in response to the secession of liquid passing through the grate;
• and
• A bolt extending through the grate, cylindrical sealing ring and screwed into the axial hole with the threads therein for compressing the sealing ring axially to deform the cylindrical sealing ring radially into clamping engagement against the interior surface of the drain pipe.