A skirted toilet can extend close to the wall or cover space that was open around an older bowl. A supply valve that worked with the previous model may be hard to reach or may interfere with the new fixture.
Compare the fixture drawing with the wall
Measure the valve location relative to the centerline of the toilet and the finished floor. Check the model drawing for clearance behind and beside the bowl. Include the projection of the valve and the space the hose needs to turn.
Make sure the valve stays usable
Ask the installer to confirm that the valve can be closed and the hose replaced without removing the toilet. If the valve needs to move, coordinate that work before the new fixture is installed.
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