Question about Gerber Blades Gerber Ultra Flush White ADA Elongated Two Piece Pressure-Assist Toilet 21

1 Answer

How do I install a gerber 21-375 Toilet? It came with no instructions.

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 5,660 Answers

The Gerber Ultra Flush Back Outlet toilet, that uses 1.1 Gallons of water to flush?

Just like any common toilet. Install the tank to the bowl of the toilet, set the toilet, install the flush mechanism in the tank, attach the supply line.

1.MAKE SURE you put the two plastic U-shaped spacers on the back of the bowl!
2.Install the round rubber gasket in-between the tank and the bowl.
3.Set the tank down on the bowl. Make sure you have the round gaskets that go up under the bolt heads, then insert the two bolts into the tank, and through the bowl. NOT installing these will cause a leak!

Tighten these bolts down, until the nuts are JUST touching the tank. (There is a flat washer that goes under each nut)
DO NOT tighten one bolt all the way, then tighten the other bolt!!
These bolts MUST be tightened evenly. Tighten one turn on one bolt, then go to the other bolt.
DO NOT overtighten, or you will break the bowl, and/or the tank!

Make sure your toilet flange on the sewer pipe is in good repair, and clean, from the old beeswax ring. It can be messy, even using gloves. Use a flat painters stick to help remove the old wax ring. Scrape off into a old can. The wax thin residue on the floor and flange is fine.
Set the new wax ring in place, remove the plastic liner that comes with the ring. DO NOT leave that thin plastic liner! It's just to install that wax ring!

Install the bolts that hold the bowl to the floor, or reuse the old bolts if they are in good repair.
Tighten EVENLY, and don't overtighten! You can crack the bowl.

Now install the toilet mechanism in the tank.
Here is a 1 Page, Tank to Bowl Installation Guide from Gerber. It is a PDF file. Let it download ALL the way before looking at it.

Should this direct link not work for you, here is the page it came from,

It's on the right side -> Installation Instruction (PDF)

Posted on Jul 02, 2009

  • joecoolvette
    joecoolvette Jul 12, 2009

    If my information, (Solution) helped I would appreciate a rating.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

New basement gerber toilet with sewage pump sys. won't clear bowl, acts like a clogged toilet. Drains dwn eventually

Check the pump operation, to see if it is running slow or otherwise clogged up as it will cause this, if you have freezing weather that to can stop the pump from operating correctly.

Dec 05, 2016 | Home

1 Answer

It has pressure, but its pushing water out into the bowl instead of down. Whats the problem?

take cot hanger Polk it in the hole,s all round it. Polk where you Se the water coming out.this works for the ordinary may have a obstructed in the out flow that you cont Se .

Feb 15, 2012 | Gerber Blades Gerber Ultra Flush 14" White...

1 Answer

Toilet won't flush

If you lift the lid off of the back of the toilet, you will see a chain that will probably be laying on the bottom of the water tank. One end connects to the rubber stopper and the other end connects to the bac side of the flushing lever. There should be 3 or 4 holes in the lever that you can connect the chain to. Once you get the chain connected, try to flush. You may have to adjust the chain by placing it in different holes until it flushes properly.

Good Luck!


Aug 11, 2011 | Gerber Blades Gerber Ultra Flush 10" White...

1 Answer

I just installed a Gerber Avalanche toilet, a two-piece unit. There are 2 rubber pads that are supposed to be placed between the tank and bowl at the very rear of the unit "to prevent china-to-china...

Sorry to read about your problem, I hope this helps you out.

you really have to tighten down the tank more, lean right on the tank, tighten, then lean left on the tank,tighten.

I tried to help you. Please help me and Rate/Vote on my response. We take the time to answer your question's. take the time to rate us.Thanks and good luck

4 Thumbs - Very Helpful
3 Thumbs - Helpful

Jan 05, 2011 | Home

1 Answer

Some toilets are discribed as needing 8 inches from the center of the bolt pattern to the water supply line.Useing a flexable line,why would this dimension be so critical?Would it get in the way of the...

That is a rough in dimension.If you make it to close ,it will make it hard to connect the flex line,and may end up kinking the linethen you'll have poor or no water flow to the ballcock

Apr 11, 2010 | Gerber Blades Gerber Ultra Flush White ADA...

1 Answer

Toilet acts like it's getting pluged up as soon as you flush .

use a two gallon buck to flush your toilet - you pour the two gallons directly into the toilet bowl if it flushes fine you need to replace the flush valve, as it is not letting enough water through to properly flush the commode. either rebuild the flush system in the tank or install a fluid master and have a good nights sleep knowing that in the morning you will not leave a suprise for someone else in the family.

Mar 15, 2010 | Gerber Blades Gerber Ultra Flush 10" White...

1 Answer

Water level in bowl too hogh

Try bendig the float rod down so th resivor dont fill so much

Oct 19, 2009 | Elements Of Design EVWC320 EcoFlush Close...

1 Answer

Toilet intermittently will continue to run until it overflows over the top...i have a gerboer 1.6 gpf. I think its the pilot valve, but i am not handy with plumbing- help!

Simple fix. Either the float is set too high, or the fill valve is busted. You can buy a new valve, (Fluidmaster brand) at any home store for about $10 and they are simple to install (easy step by step directions on box). Plumber will charge $85 minumum to do this.

Aug 26, 2009 | Gerber Blades Home

Not finding what you are looking for?
Gerber Blades Gerber Ultra Flush White ADA Elongated Two Piece Pressure-Assist Toilet 21 Logo

1,361 people viewed this question

Ask a Question

Usually answered in minutes!

Top Gerber Blades Home Experts

john h

Level 3 Expert

14512 Answers

Tom Chichester

Level 3 Expert

44097 Answers

Brad Brown

Level 3 Expert

17164 Answers

Are you a Gerber Blades Home Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides