How to replace a pool filter multiport valve

WRITTEN BY:  Inyo Pools

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The Multiport Valve on your filter could be called the command center, from this one piece you can have your filter complete six to seven different functions. For example Normal Filtration, Backwash and Rinse. Without a properly working valve your filter would be unable to function properly. In this guide we will walk you through on how to replace a damaged or old Multiport Valve.

Things You'll Need

Step by Step


Step 1

First, before disassembling your filter or changing the valve lever position turn off your pool pump to prevent any excessive water loss or safety hazards. Now that your water is no longer circulating through your filter system, switch your valve to the "Closed" position.

Step 2

Before disassembling the body of your filter you will want to drain the system of its water. Locate the drain plug for your D.E. filter it will be on the lower portion of the filter. In our model it is located here. Wait until the pool filter has completely drained before moving forward.

Step 3

To be able to remove the multiport valve from the filter body you must first remove it from the plumbing lines of the pool to do this you will need PVC cutters. Cut the inlet and outlet pipe PVC Cutter for up 2" pipe part #: 99-362-1050

Step 4

When cutting the pipe you will want to leave enough room between the cut and the port of the valve for a coupler. This gap will be important when installing the new valve into the line. A gap no bigger that six inches on the inlet and outlet will be sufficient.

Step 5

Once the plumbing has been cut to the valve the next step will be unscrewing the unions that connect the valve to the filter. The unions on a Sidemount valve will look like this

Step 6

In cases in which you have a Top Mount Valve after disconnecting the plumbing lines you will need to unscrew the valve or unfasten the clamp depending on your style of filter.

Step 7

When the unions are finally unscrewed your valve can pulled off the filter's valve ports. Discard old multiport valve at this time.

Step 8

Now onto install your new Filter Multiport Valve.

Step 9

First thing to do will be to connect the union connections to the filter body. This will create a stable platform for when you perform the replumbing later.


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Inyopools  Posted: 08/30/2017 11:13 AM  Inyo Product Specialist

6qlD4v.. - Thank you for your comment. It looks like this guide was started and inadvertently put on the website before it was finished, then forgotten. See our guide on "How To Install a Pool Sand Filter" for some of this information. We will put this guide back into the hopper to be finished at a later date.

6qlD4vJW+UQHmTmL/uzW6QxUrCO9B/wTlqlvoSmx4dA=  Posted: 08/29/2017 21:31 PM 

Where are the rest of the steps? I just see up to step 9 and then it second page, etc. Is something wrong with the webpage?

Inyopools  Posted: 06/21/2016 12:37 PM  Inyo Product Specialist

kim - There is a bearing washer under the handle that may be cracked or the valve spring may be weak and need to be replaced.. See our guide on "How To Replace a Pool Multiport Valve Spring".

kim  Posted: 06/20/2016 20:54 PM 

i have an american products filter and multiport valve circa 1995
the filter still works well but the handle on the multiport is hard to turn
is there a solution for that?

Inyopools  Posted: 05/09/2014 16:57 PM  Inyo Product Specialist

Check the manufacturer of the filter to see if you have a screw on Multiport Valve. If it is a screw on and both the MPV and the filter tank are plastic, try soaking the joint with a TSP solution. Then attach a strap clamp around the bottom of the MPT and twist it counter-clockwise. Have someone tap the joint gently with a rubber hammer as you are twisting it. Hopefully, this MTV was not glued on to the filter tank.

Anonymous  Posted: 05/09/2014 11:52 AM 

In step #6 (my top mount does not have the clamp part), I can not unscrew it from the body. I even tried using WD-40 several times letting it alone to soak in to help loosen it as my pool supplier suggested. I even used a piece of wood with a hammer to try to nudge it. It does not budge.
Any more suggestions?