A valve plug comprising a cylindrical body having an annular flange with a top surface, a bottom surface, and a circumference is disclosed. The valve plug further comprises an annular recess disposed in the bottom surface of the flange, and a plurality of holes disposed in the top surface of the flange. Each hole extends into the recess to create a plurality of channels extending between the bottom and top surfaces of the flange. Each channel of the plurality of channels includes a stepped portion. A polyurethane sealing member is disposed within each channel and includes: a top portion forming a continuous bond on the top surface and along the circumference of the flange; a central portion forming a horizontal bond on each stepped portion; and a bottom portion forming a sealing surface adapted to sealingly engage a seating surface of the seat.