Question about Porcher 83420-00.000 L'Expression Toilet Replacement Flush Assembly

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My Porcher flush assy #83420 is now discontinued and i would like to replace the lower gasket instead of buying a whole new toilet.The gasket is located on the bottom of the piston assy. sealing the tank during fill-up.

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I don't have an answer but have the same problem. Did you find a solution anywhere?

Posted on Aug 13, 2010


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

Hi there,
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Posted on Jan 02, 2017


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Where can I find a replacement parts to rebuild a porcher Veneto one piece toilet
Parts breakdown.

Specs are above. Immediately below is the company site but they may only offer some support rather than directly providing any parts. I list a couple of possible sources for parts after that.

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1 Answer

Where can I get a Porcher L'Expression flush valve gasket?

I was in the same situation. Cost me $2.38 to fix. Ordered 12" x 12" rubber sheet from Sustainable Supply and made my own flush valve. Easier than I imagined. All I did was trace the old flush valve on to the sheet with a Sharpie and cut it out with a pair of scissors. Yep, it was that easy. I ordered the 1/32" sheet and it worked on the first try. I would order the 2/32" next time because my handmade flush valve is a little thinner than the original; however, it works perfectly. I was shocked. I had searched the Internet and called all places I found and then decided to give it a go on my own. Here are the works.

Sku: C1749648
Rubber, Buna-N, 1/32"Thick, 12"x12", 70A - 4070-1/32A

Jan 21, 2016 | Porcher 83420-00.000 L'Expression Toilet...

1 Answer

Flush Valve leaking

replace the whole valve. It's cheap and easy to do. Probably you can install a universal valve. Look on e-bay or amozon

I’m happy to help further over the phone at

Dec 05, 2012 | Toto Aquia II Dual Flush Toilet

1 Answer

Leaking toilet from overflow

if you flush and the water continues to run into the bowl the it is the flush washer that needs repalcing
If that water shuts off and the cistern fills and then continues so that it flows down the over flow pipe into the bowl the it is the water inlet control washer that needs replacing

Feb 20, 2018 | Porcher Home

1 Answer

Where do I get porcher 83420


That particular model has been disontinued; however, you may want to contact Customer Service to see if there are any spare parts in stock.

Paul, ASB

Sep 20, 2011 | Porcher 83420-00.000 L'Expression Toilet...

1 Answer


either the fill valve is running and water is draining into the bowl via the overflow tube in the tank or the flapper is bad (or foreign matter) and it is allowing water to escape into the bowl through the flush valve slowly...causing the tank to drain and the fill valve to run every few minutes or so. start by inspecting/cleaning or replacing the flapper and hopefully that will do it because a one piece toilet flush valve needs a special wrench,to remove it, that you use with a ratchet. If you buy a new flush valve, it comes with the wrench (glorified piece of plastic) and is not too difficult to get the flush valve out. you can get a replacement at They do mail order, too. All you need is the toilet type - a four digit number embossed in the tank starting with a 2. hope this helps but if you need anything else just ask:)

Jul 29, 2011 | Porcher VENETO II One-Piece Toilet -...

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I have a Porcher one-piece toilet with a bad gasket. How do I take it apart and replace the gasket?

if you are talking about the wax ring you remove the floor mounting bolts and replace the wax ring under it. first you want to shut water off then flush to empty tank and with a wet dry vac remove any water left . now you can remove it without any mess.

Jan 05, 2010 | Porcher 40050 Classic Elongated Toilet...

2 Answers

What is the procedure for replacing the flush valve assy on a san raphael toilet. it is a one piece tank and bowl assy and must install from the inside of the tank. it appears to possibly rotate into place...

If you purchase the flush valve from Kohler, it comes without instruction. Rotation is the key to removal. First note the exact orientation of the assembly before attempting removal. Unhook the flapper chain and remove the flapper. The old assembly does indeed rotate in either direction for removal. I used a counterclockwise motion. (it was a tough turn, don't break the bottom of the bowl where the valve seat is located.) Then install the new foam gasket on the assembly. The new assembly is replaced in the reverse manner. I removed the new flapper from the flush valve for ease of install. You must put significant downward pressure on the flapper seat while rotation is accomplished. Orient the assembly as was the old one. Replace the flapper, connect the chain and observe the flapper for proper opperation.

Oct 03, 2009 | Kohler K-3384-2-0 San Raphael elongated...

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Does not flush completely. Works 2 out 3 times.

Needs new flushing mechanism. Remove Cistern, Remove flush siphon and either replace siphon washer or replace complete siphon.

Jun 09, 2009 | Porcher 40050 Classic Elongated Toilet...

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