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Installing a rear outlet toilet can certainly enhance your bathroom's aesthetic and functionality. This guide will provide a step-by-step approach on rear outlet toilet installation, but we recommend consulting professional help if you are unfamiliar with installing bathroom fixtures.
Tools and Materials
Adjustable Wrench
Level
Hacksaw
Drill
Pencil
PVC or ABS Glue
Steps to Install a Rear Outlet Toilet
STEP 1
Shut off the water supply lines where the new toilet is being installed.
STEP 2
If your toilet is one piece only, move on to the next step.
If you are installing a two-piece toilet, slide the tank bolts through the mounting holes on the top of the base of the toilet and thread the washers and nuts onto the tank bolts.
Verify that the tank is level and alternately tighten the washers and nuts until the tank is resting firmly on the bowl.
STEP 3
Place the toilet in the location where it will be installed.
STEP 4
Measure the distance from the back of the waste outlet on the toilet to the wall hub fitting to determine the length of the P-trap connector. The connector should extend approximately 1-1/2" into the hub fitting.
STEP 5
Trim the P-trap adapter with a hacksaw to the appropriate length as necessary.
STEP 6
Mark the location of the pre-drilled mounting holes using the holes in the base of the toilet as a template.
STEP 7
Remove the toilet from the work area and drill mounting holes in the locations designated in the previous step.
STEP 8
Apply PVC or ABS glue around the P-trap connector and place inside the hub fitting.
STEP 9
Slide the toilet into place and press the waste outlet into the P-trap connector.
STEP 10
Once the toilet is securely in place, insert anchor bolts and washers through the mounting holes in the base of the toilet and tighten into the pre-drilled holes created in step 7.
STEP 11
Place caps over the anchor bolts on the base of the toilet.
STEP 12
Connect the water supply tubes at the bottom of the tank. Turn on the water supply and flush the toilet several times to check for any leaks around the back or base.
STEP 13
Attach the toilet seat by placing it on top of the bowl and securing it in place with supplied bolts.
STEP 14
Finish your installation by applying latex caulk or tile grout around the base of the toilet. This will finish the joint between your floor and toilet bowl and divert water away from the base of the toilet.
The standard rough in height for a rear discharge toilet, or rear drain toilet, is typically about 4” from the floor to the center of the outlet pipe.
Typically, larger outlet sizes will improve the overall performance of a toilet, make sure to measure your system to ensure the largest possible outlet can be installed.
The main difference will be where the water supply connection is located. For bottom entry toilets, the water line connects to the cistern near the base. For back-entry toilets, it is hidden from view and connected directly from the back of the cistern.
No, rear outlet toilets don’t typically require a bidet outlet but there are bidets available that are specifically designed for rear outlet toilets.