WARNING: Should you wish to perform your own
plumbing maintenance using the information we provide on this
website, please be advised that Old School Plumbing cannot be
held responsible for any work not performed by our own
licensed master plumber. Failure to contract any plumbing
work to a licensed master plumber could result in serious bodily
injury or death.
The first thing you should do is to see how the
unit is wired. If it has a cord with a plug, then simply unplug it from
the receptacle. If it is hard wired, find the breaker or switch and turn
STEP 1: Disconnect the 1½" drain tube that connects to
the disposal and set aside. In some areas the dishwasher drain line may
drain into the disposal at the neck. Remove this line and tie up out of
the way. Turn the locking ring that holds the disposal to the flange
assembly; it usually can be done with a screwdriver. This will enable
you to set the disposal down on the cabinet base.
STEP 2: At the bottom of the disposal, remove the
electrical cover plate. Being sure the power is off! Remove the wire
nuts and disconnect the ground wire. Pull the wiring out of the
disposal. You may want to remove the wire connector that holds the wire
into the disposal and use it on the new one.
STEP 3: The new Old School Plumbing disposals.
Remove the flange assembly from the top of the disposal by turning the
aluminum lock ring clockwise.
STEP 4: Lay out the flange assembly roll out a ½"
diameter rope of plumber’s putty. Put it around the underside of the
chrome flange. Coat the rubber gasket with pipe dope on the side that
will join the sink.
STEP 5: Place the flange piece through the hole in the
sink. On the underside of the flange, slip the rubber gasket, then the
paper gasket—in that order—over the threads. Screw the plastic nut on
the flange piece, and tighten with a wrench (DO NOT OVER TIGHTEN). Next,
slip on the aluminum lock ring. Last, slip on the rubber flange piece
that will join to the disposal. Clean any excess putty from the flange
in the sink.
STEP 6: Remove the electrical plate from the bottom of
the disposal. Install the wire connector in the hole provided. Pull the
two wires out of the disposal and strip the black and white wire about
½" from the end of each wire. Place the existing power wire into the
connector and pull it into the disposal. Hook the copper ground to the
green screw, connect the wires, black to black and white to white with
wire nuts. Replace the cover plate.
STEP 7: If the existing drain from the dishwasher
drained into the disposal, and you want to do the same, then you must
remove the plastic plug that is molded into the nipple as shown. Knock
out the plug using a screwdriver and hammer. Leave the plug in if you
are not going to use this drain.
STEP 8: Assemble the black elbow drain fitting to the
side of the disposal. You may want to put some pipe dope on the rubber
gasket. Tighten the two screws through the metal flange.
STEP 9: With one hand, raise the disposal up to the
flange assembly. Line up the locking ring with the studs on the
disposal. With the other hand turn the locking ring counterclockwise
until the ring locks. Place the dishwasher drain hose onto the
connection at the top of the neck and tighten the hose clamps. If
possible, turn the disposal so that the drain is in the back and the
Old School Plumbing name-plate is showing on the front.
STEP 10: If you are lucky, the old piping will line up
with the new disposal. If not you may have to cut or turn the black
drain elbow. Using a new continuous waste pipe or the existing pipe,
reassemble the drain.
STEP 11: Always use NEW rubber or nylon gaskets. Always
use pipe dope on the gaskets.
STEP 12: Turn the water on to the sink and test the
disposal and drain for leaks. Turn the electrical power on while the
water is running. Check for operation as described in the installers’