The toilet in a mobile home connects to the main drain in the same manner as toilets do in framed houses or manufactured homes. The flange is anchored to the floor through anchor screws, and holds the toilet in place through retaining bolts. The piping beneath the toilet in a mobile home is held in place with suspension lines. Replacing the flange is a good time to check the pipes for stability beneath the mobile home, but the project does not require climbing beneath the home.
Turn water off to the toilet and drain the unit by flushing the toilet. Disconnect the water supply line from the base of the toilet tank.
Loosen and remove the retaining nuts on the lower sides of the toilet with an adjustable wrench. Set the nuts and any washers to the side. Lift the toilet off of the retaining bolts and lay the unit on its side.
Scrape off any residual wax gasket material from the base of the toilet. Press a new wax gasket onto the toilet with the rubber grommet facing down and away from the unit.
Mark the position of the retaining bolts by drawing a line pointing to the location of the bolts to the left and right of the flange. Unscrew the retaining screws holding the flange in place and lift the flange off of the floor. Scrape off any remaining wax gasket material from the drain opening. Remove the retaining bolts from the flange.
Place the new flange onto the drain. Rotate the flange until the screw holes are on opposite sides of the original locations, but the ends of the channels for the retaining bolts line up to the marks. The new flange will be rotated 180 degrees in comparison to the original. This is necessary as you will drive new screws into the floor. Mobile home floors are relatively thin and you do not want to reuse the existing screw holes in the floor.
Drive 2-inch wood screws through the screw holes on the flange into the flooring. Wiggle the flange to make sure it is stable. Slide the retaining bolts into the channels and line the bolts up with the marks on the floor.
Lower the toilet onto the retaining bolts. Attach the washers and nuts previously removed. Wiggle the toilet slightly to fully seat the new wax ring. Tighten the retaining nuts down until the toilet does not move. Attach the water line and turn on the water.