Choose a standpipe flood guard gasket model by following our link in the Resources section. Buy a 1 1/2-inch IPS pipe if using a 4-inch standpipe flood guard gasket.
Remove your floor drain trap and clean both the trap and your floor drainpipe.
Install your standpipe flood guard, if installing the 4-inch model, by placing the guard into the top of the pipe below the floor drain trap inset area with the screw heads facing up.
Turn the screws with your flat or cross head screwdriver until the rubber gasket seals tightly against the drain pipe and then thread your 1 1/2-inch IPS pipe into the gasket. If using the 3-inch model, thread your pipe into the flood guard gasket before placing the gasket into the pipe.
Push or screw your floor drain trap back into the floor drain. If you have difficulty with reinstalling the trap, lightly tap the trap back into place with your rubber mallet.