Drain jointing system

A sealing joint assembly for joining a drain pan with a drain pipe through a drain hole in said pan and comprising a fitting having an inside wall larger in diameter of the outside of the drain pipe whereby with the fitting in place forming an annular cylindrical pocket between said inside wall and the outside of the drain pipe and said fitting having an annular radially inwardly extending rim at one end of the fitting forming a bottom for said pocket, the improvement comprising, a first ring of synthetic plastic resin material at the bottom of said pocket, said first ring having a substantially solid cross sectional form, a seal ring of synthetic plastic resin material of resilient consistency in said pocket at a location above said first ring and a second ring of synthetic plastic resin material in said pocket at a location above the seal ring, said second ring having a substantially solid cross sectional form, said seal ring comprising spaced inner and outer wall sections and a bottom wall joining said inner and outer wall sections, said inner wall section being in initial position tilted diametrically inwardly away from the outer wall section to a position wherein the innermost portion of said inner wall section initially has a diameter smaller than the diameter of the outside of said drain pipe, and an annular bead on one of said wall sections at a location facing the other wall section having when assembled a relatively narrow annular line of engagement with said other wall section whereby to increase the sealing effect between said inner wall section and said drain pipe.