How to Replace a Spider Gasket on a Multiport Valve

WRITTEN BY:  Inyo Pools

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Step by Step


Step 1

Stop pump and release all pressure from system.

Step 2

Place the selector handle at the "winterize" position (this lifts the plug off the seat).

Step 3

Remove the bolts and nuts holding the cover to the valve body. Remove the cover assembly.

Step 4

Remove the old gasket from the valve cover assembly. If the gasket is glued in, you may have to scrape it out with a small screwdriver to get most of it out. Be care that you do not score the plastic groves.

Step 5

Make sure that the gasket groove is free of water, grease, oils, debris and parts of the old gasket. Use NON-acetone finger nail polish remover to remove any gasket residue. Make sure the remover is NON-acetone or it will melt the plastic. Please note that not all multiport valve gaskets are glued in. If the gasket on your valve isn't glued, you would bypass Step #6.

Step 6

NOTICE: Once this step is started, continue through Step 10 without interruption. Using an Adhesive For Valve Seat Gasket apply glue sparingly (a bead about 1/16" wide) to the bottom only (not the sides) of the spider groove in the valve body. The glue lines must be continuous and intersect at the intersections of the grooves.

Step 7

Insert the new gasket into the groove with the rounded bead up. Press the gasket firmly into all groove areas to seat the new gasket evenly.

Step 8

Align the tab on the cover assembly with pin on the valve body, fastening it with the bolts and nuts removed in Step 3. Tighten all bolts evenly.

Step 9

Depress the valve handle and rotate it to the closest standard position (FILTER or RINSE), being careful not to rub the plug on the new gasket. Release the handle, allowing the plug to hold the gasket in place while curing.

Step 10

Minimum cure time is 2 hours. Curing for 24 hours is recommended for full strength.


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Jeanine  Posted: 10/7/2018 

Thank you! For posting this video!!!! It was so easy! Last time I paid a poor repair company to do it. Thanks again!!!!!!

InyoPools Product Specialist Patrick P.  Posted: 10/8/2018 

Jeanine, Thanks so much for the kind words and we are glad we could be of help!

Matthew  Posted: 8/14/2018 

Hello George - this is an odd situation. A gasket should not fail that often, especially one as vital as the spider gasket. The couple of things that come to mind the gasket groove or diverter has a defect. But if the problem has persisted to a new valve, the likelihood of that being the cause falls greatly. Are you changing positions while the pump is running? This is a common mistake made by pool owners. The pump needs to be off when changing valve positions or the gasket can be dislodged or damaged.

George Taylor  Posted: 8/13/2018 

I replaced the gasket on my Hayward Multiport Valve (710XR50) multiple times and every time I need to either backwash or set to Waste the gasket gets Pinched/Damaged in the same area near the port for waste. I need to replace the gasket every time I move the valve. I also have replaced the "head of the valve" last year thinking this was the cause but trouble remains. Any ideas? Thanks

Inyopools  Posted: 5/17/2018 

The SP1091Z number did not bring up anything for us. What is the model number of your Hayward filter?

Anonymous  Posted: 5/16/2018 

I have a leak from the backwash "port". I can not longer read the SP number on the top of the filter. I did get SP1091z off of an imprint in the backwash port. What part number do I need for a new gasket? Thanks

Inyopools  Posted: 3/9/2018 

Ed - The spider gasket for the SP0714 family of valves is no longer sold alone but is sold glued into the valve diffuser. To replace this gasket, you will need to purchase the Key/seal Assembly (Diffuser w/ Gasket Glued In) (spx0714ca).

Ed  Posted: 3/8/2018 

Hello, I need a spider gasket for a SP0714G11M. What is the correct replacement gasket? Thanks,

Inyopools  Posted: 2/14/2018 

darlynne huddleston - There are several models of the Triton II Pac-Fab valve. I would have to have the model number of the valve to pinpoint the spider gasket. Your best bet might be to try to match the number of spokes and dimensions of your gasket to this spider gasket list.

darlynne huddleston  Posted: 2/13/2018 

My filter is a Triton II . Pac-Fab...which gasket do I need. sent for one but it doesn't fit in size...

Inyopools  Posted: 2/12/2018 (SP0714 gasket) - Hayward no longer sells the spider gasket on a SP0714 by itself. To replace the gasket you must buy the Key/seal Assembly (Diffuser w/ Gasket Glued In) (spx0714ca). See our guide on "How to Replace a Hayward Key Seal Assembly".

Anonymous  Posted: 2/11/2018 

I have the Vari-Flo XL valve SP0714. Which gasket does it use?

Inyopools  Posted: 10/19/2017 

Bill - Yes, that is a match for your model. And Since your model does not have a Winterize, you can use use any of the other positions when disassembling the valve. Just make sure it is assembled in the same position and lift it straight off when pulling it apart.

Inyopools  Posted: 10/13/2017 

Ralph - If your gasket was not secured with glue, it may have rolled out of parts of its groove, causing the seals between the ports to leak. Pull the top of the valve off again and see if your gasket has moved out of the grooves. If so, check for any damage to the gasket, replace if necessary, then glue the gasket into the grooves as suggested in this guide.

Ralph  Posted: 10/9/2017 

I replaced my gasket but forgot to put glue on it, is that the reason that even when in filter mood my filter is throwing water out like if it was in backwash? It even drained out my whole spa... anyone know if this is the issue or something else? Only time water stops coming out like if it was in back wash is if I close all the valves off

InyoPools Product Specialist Dennis R.  Posted: 9/15/2017 

DMG123 - As you probably know, some valves come with the spider gasket glued in solid. The only way to replace the gasket is to but the key assembly that holds them. When you say the gasket was completely melted, was it damaged or was the gasket just installed solidly? Was it deteriorated to the point where it leaked like the first one? If so, that is highly unusual, and I would talk to the company you bought the valve from.

DMG123  Posted: 9/11/2017 

Hi, I have replaced my multiport valve last year due to the gasket seemingly melting into place, unable to remove anything more than bits and pieces. I just received the new valve, which came with a gasket, flushed the lines and went to check the gasket after and again, completely melted. Anyone ever deal with this? I am wondering if they came melted in, from being stored in a warehouse in the heat or something?

InyoPools Product Specialist Dennis R.  Posted: 9/3/2017 

john p - It sounds like the previous owner used the wrong glue when he replaced the gasket. You may be at the point where you have to buy a new Key Assembly that holds the gasket. See our guide on "How To Replace a Pool Multiport Valve Spring" This guide includes information on replacing the Key Assembly.

PGB  Posted: 10/29/2018 

I have Model SPO715G50M. I bought the kit to replace the o rings, but I cannot remove the spider gasket. This is the first time this is being replaced. Is it glued in?

InyoPools Product Specialist Robert M.  Posted: 10/30/2018 

Hello PGB - Yes, the original spider gasket in the SP0715 valves is glued in place. Steps 4 & 5 explain how to remove the old gasket. We would recommend using an RTV silicone adhesive when you install the spider gasket. The spider gasket for the SP0715 valve is part number 4701-10.

john p  Posted: 8/30/2017 

I did everything this guide said up until removing the old gasket. I physically cannot remove it no matter how hard I pull and I can’t upturn it with screwdrivers, pliers or any other tool. I’ve basically torn off a lot of the rubber but there is still so much I can’t remove. I don’t know if I’m doing it wrong or the original person who installed did it wrong. Please helP

InyoPools Product Specialist Dennis R.  Posted: 7/18/2017 

Anonymous (handle won't turn) - The white plastic bearing washer underneath the handle may be broken. See our guide on "How To Replace a Pool Multiport Valve Spring" for instructions on locating and replacing this washer.

Anonymous  Posted: 7/16/2017 

I just replaced my gasket and now the handle won't turn and water is still coming out the backwash line while it is set to filter. Any ideas?

Luke  Posted: 7/3/2017 

I just ordered your Vari-flow 5 Gasket for my Pentair Multi-port Backwash Valve (27-1140) being run with a Triton Sand Filter and a Hayward pump. This is my second try so I'm just trying to get it right! Will this work? Thanks....

InyoPools Product Specialist Dennis R.  Posted: 7/3/2017 

O2Rocker - The plug is the upper part of the assembly that the gasket is set in. The intent here was to make sure you depressed the handle all the way down so that the gasket in the plug does not rub against the lower body of the valve while the gasket glue is drying.

O2Rocker  Posted: 7/2/2017 

Step 9 says, rotate handle being careful not to rub plug. What "plug" are you referring to and how do you avoid rubbing it? Thx.

InyoPools Product Specialist Dennis R.  Posted: 6/17/2017 

nece - It is not absolutely necessary to set your MPV to "winter". Just make sure to line up the top and bottom of the MPV together correctly when reassembling the MPV.


nece  Posted: 6/16/2017 

I do not have a winter setting on my valve. It is a Haward and looks identical to the one in the picture. What should I set the valve on when changing the spider gasket?

InyoPools Product Specialist Dennis R.  Posted: 5/15/2017 

Karen - Unfortunately, we do not sell replacement parts for the NE6170 Filter 6 Way Valve.

Karen  Posted: 5/12/2017 

I need a spider gasket, but the only numbers I see on the filter is NF6170, it's a 1.5 hp blue wave sand filter, water leaking out of back wash, pool stays cloudy

InyoPools Product Specialist Dennis R.  Posted: 3/19/2017 

Spider gasket - Inspect the gasket again for tears or breaks. Then try lubricating it. If that doesn't work try gluing the cross points on the gasket to the key assembly. don't use a lot of glue. And remember to turn the pump off before rotating the handle.

Anonymous  Posted: 3/14/2017 

Hi, I have only recently changed the spider gasket. About a couple of years. It still looks new. It has started to leak again from the multivalve. When I replaced the gasket before I did not put any adhesive or lubricated it.

InyoPools Product Specialist Dennis R.  Posted: 9/28/2016 

Backwashing without shutting off pump - There's a good chance that you have blown the spider gasket. Do you see water flowing or leaking out the waste line when the valve is in filter mode? Pull off the top of the valve and take a look at the gasket.

Anonymous  Posted: 9/28/2016 

Hello , my wife did a backwash without turning off the pool first, we have been losing a lot of water since. could she have broken a pipe somewhere?

InyoPools Product Specialist Dennis R.  Posted: 8/13/2016 

valve leaking - It sounds like you have a spider gasket going bad. That's the only thing that controls the flow of water through the filter. Check the gasket for cracks and replace it if required.

Anonymous  Posted: 8/12/2016 

I have a sand filter and an inground pool.I turned off my filter, n switched to backwash to empty water from my pool. I then turned filter off and switched back to filter. There is still a little bit of water leaking from waste pipe it wasn't before

InyoPools Product Specialist Dennis R.  Posted: 8/6/2016 

lesg - I could not find a match on FIMTA 50-90 v-w. Try matching your spider gasket to one of these listed in our Spider Gasket EZ Find list.

lesg  Posted: 8/4/2016 

I have a problem with my 5 way new seat system. The seal is broken, the only name I can find on the unit is FIMTA 50-90 v-w.
Could you please advise?

InyoPools Product Specialist Dennis R.  Posted: 6/27/2016 

spider gasket - The large hole in the spider gasket that takes up half of the gasket in used in all modes as the gasket is rotated around with the handle. See our guide on "How a Multiport Valve Operates II" for a more complete explanation.

Anonymous  Posted: 6/26/2016 

Is the lage hole in the spider gasket for the filter o the backwash?