How to Replace a Spider Gasket on a Multiport Valve

Written by:  Danny Rhodehamel
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 (3.4 OUT OF 5 STARS ON 20 RATINGS)

Follow these steps for spider gasket replacement for pool filter multiport backwash valves. PLEASE NOTE THAT THE VALVE USED IN THIS GUIDE IS FOR ILLUSTRATIVE PURPOSES ONLY. THE DIFFUSER ON THIS VALVE COMES WITH THE SPIDER GASKET PRE-GLUED IN.

Tips & Warnings

Video

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.

Comments (1 to 40 of 129)

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User: Inyopools

Terry - Try using NON-acetone finger nail polish remover to remove the gasket residue. Pentair rep says it works like a charm. Just make sure it is NON-acetone remover or it will melt the plastic.

User: Inyopools

sand in pool - If the filter's standpipe is cracked, sand will be coming through that crack into your pool and the pipe assembly will have to be replaced. To do this you will have to remove your filter's sand and I would also replace the sand at this point. I would wait on replacing the spider gasket until you see if replacing the standpipe solves your problem.

User: Inyopools

john - According to the Pentair tech rep, you pull or scrape the spider gasket out of the bottom plate grooves and then use NON-acetone finger nail polish remover to remove the residue. Be careful not to score the plastic in the groove and make sure the remover is non-acetone or it will dissolve the plastic. To glue the new gasket in, use Adhesive For Valve Seat Gasket.

User: 

I have sand coming through the returns into my pool. Do you think I need to replace just the spider gasket on the multi port? I also think the white piece (name?) is cracked could this be the issue as well?

User: john

I have Pentair HighFlow MPV, and the diverter seal (gasket) is glued in tight, unlike the Hayward one in your video. Have you tried to remove the gasket from Pentair HighFlow MPV or talked to a Pentair rep about removing it? What's is the best way?

User: Inyopools

Terry - Unfortunately, it sounds like someone glued the spider gasket in with the wrong glue. If you can't get the gasket completely out without gouging the plastic and assuming this is a Pentair High Flow MPV, you may have to buy a new Bottom Plate, 2" W/gasket, like the one shown in this link.

User: Terry

I cannot get the old gasket off my Hi-flow valve. It looks like it was put on with silicone perhaps.I believe it is called a seal diverter or a spider gasket? I am scraping it and brushing it with a wire brush and I am getting very few results. Any suggestions?

User: Inyopools

henleytoo - Colors change. The gasket may not be white any longer. Here is a link to many of our Spider Gaskets. See if you can find a match by number of spokes, manf, and dimensions. I would have guessed your gasket is 4710-10X - 2nd row - 5 over.

User: henleytoo

Where can i buy the white gasket? I was sold a black one that will not work... we have a hayward veri flo xl thank you!

User: Inyopools

spider valve - I've heard this also but I'm sure you are not the only person to turn it the valve both ways. To be safe I would turn the valve clockwise from now on. The more important tips are to make sure the pump is off when you move the handle and to make sure the handle is depressed all the way down before you rotate it. There are no requirements for regularly maintaining the MPV. It may just be stiff from none use.

User: 

I did not realize until just recently that I was only supposed to move the multiport valve filter in a clockwise direction!! Have I done long-term harm to the valve? (The pool is almost a year old.) That was never mentioned to me by the builder, so maybe it is common knowledge to everybody but me!!

Also, I noticed that the multiport valve seems a little harder to move this year than it did when I closed the pool. I had a tarp over it all winter but it does remain uncovered the rest of the year. Is there any regular maintenance (lubrication of some type, etc.) required to keep the multiport valves working properly?

User: Inyopools

DJ - I'm not sure I understand your question. The water must be turned off. The Multiport Valve is taken apart and the cover assembly removed to replace the spider gasket.

User: DJ

How do I keep the water from coming into the multiport when trying to glue in the spider gasket?

User: Inyopools

Koicarer - Unfortunately we do not carry Aquadyne parts and I would not use a gasket that looks like what you need. Generally they are not interchangeable. Try looking on the internet. I see that Aquadyne filters are listed there.

User: Koicarer

Can you tell me where I can purchase a Spider Gasket for Aquadyne filter? The one in this page looks the exactly same as mine. Thank you,

Chris

User: Inyopools

Jim - Thanks very much for your compliment to Rob. We all like to see positive feedback like this. I passed your comment on to Rob and his supervisor.

User: jimmac94

I chated with Rob in fla. on 7/11/14 he was very very helpful with my problem I am having with my filter...(spiter valve)its nice to talk to someone who is not just trying to sell u something.i know I will be needing new filter in the future mine is 12 yrs old and I will be buying from his company inyopools...again thanks so much Rob...jim springfield mass

User: Inyopools

Rabbman214 - Some of the common problems for low water pressure are contained in this guide: "How To Correct Low Water Pressure in Your Pool System". A clogged impeller is one of the more common problems.

User: Rabbman214

I have low pressure in the filter and backwash position of the MPV and zero reading on the water meter. I replaced the meter and still not enough pressure to filter the water. Any idea what the problem may be?

User: Inyopools

steph - Not sure why this is happening on a new multiport valve, but it sounds like you may have to replace the spring or washers in the top handle assembly. See our guide on "How To Replace a Pool Multiport Valve Spring" for further instructions.

User: steph

I just replaced the multivaulve on my sand filter. Now its leaking around the handle. Can you please help?!

User: Inyopools

Jane - If you have to glue in your multiport valve spider gasket, wait 2 hours before you use the valve.

User: Jane

The last step, item 10 references a 2 hour minimum cure time, what does that refer to in the process?

User: donna

yes i need the white gasket the spider gasket and i need the sticker that go on the top the says where the flush and back wash are at

User: water rat

I just bought the new top multi port assembly causee spring and hanfde juat would not adjust. I don't have good flow when I backflush. How do I get that to work?

User: Inyopools

Poolboy 1 – If you have sand getting into your pool from the sand filter, you may have a damaged spider gasket as you suggest. That is one place to check. Also see our guide on “How To Reduce Sand in Your Pool” for other possibilities to check.

User: Poolboy1

I have sand from the sand filter that is getting into my pool and I also see it when I backwash. Does that mean the spider gasket needs to be replaced? Thanks

User: Inyopools

Hubsy - I could not find a Praher 310-3 in our system. Try matching the spider gasket by size. See "Spider Gasket EZ Parts" for a list of Spider Gaskets.

User: Hubsy

My system is about about 15-20 years old. I have identified the logo as Praher with an information tag that reads 310-3. Does the "3" designate the vavle as a 3" valve if not what identifies this dimension. Is it the ports/plumbing size. The spider gasket needs replacing (leaking from the backwash pipe)during filtration.

User: Inyopools

emily - You might try to break the corrosion by tapping around the top of the valve with a rubber hammer. Then apply leverage gently.

User: emily

Hi, The handle on top of my onga filter will not turn. It has been left standing for quite awhile. Have been advised to take off nuts at the top to soak unit but even after the nuts have been removed I cannot take it off.. Perhaps it needs gentle leverage? ?Any suggestions gratefully received.

User: 

One key point the video does not mention, or at least I didn't catch it, is this: The gasket has a flat smooth overall surface on one side, and then a raised half-round rib along each spider leg on the other side. The side with the raised rib needs to be placed into the valve facing upward. These ribs are what helps separate water in the diverter vavle flow. This is correctly shown in the video, though not mentioned. This tip is not mentioned in my Hayward literature nor has it ever benn made clear on replacement gaskets I've bought, but perhaps the most important tip in installing these right! Hope this helps!

User: Inyopools

Help - Your backwash water looks clearer than the pool water because you aren't seeing the same volume. It has to be the same water. Is all of your pool water going through the filter every day? You might have to leave the pump on longer each day. Also you might need a larger filter.

User: Help

I have been fighting green water for over a month.
I have tried every chemical known and have also replaced the sand.
Now I actually think it is a pump problem.
When I backwashed this morning NOTHING came but clear water?
Why would that be???

User: Inyopools

crawdaddy - See our guide on "How To Replace a Pool Multiport Valve Spring". It covers how to change out the spider gasket assembly.

User: crawdaddy

I just received the multiport part for my SP0714C sand filter. How do I take apart the glued in gasket section from the top handle portion?

User: Inyopools

Spider gasket - Generally if the vendor sells the spider gasket separately, it does not have to be glued in. If you wish to glue it in, we recommend "Adhesive For Valve Seat Gasket".

User: 

Does the spider gasket for the Praher Multiport valve Model # TM-12-L have to be glued in? If so, what kind of glue?

User: Inyopools

gid - Backwashing has nothing to do with your pump failing. It sounds like you have an electrical problem. Make sure your circuit breaker is set on. Then check that your wiring connections to the pump are tight. If you have a timer, check the pump connections there. Sometimes the timer fails. Check that you have power at the timer output terminals when the timer is on. If your pump is humming without turning on, try replacing the motor's capacitor.

User: gid

I backwashed with pump on. Now the pump wont respond, even when i switch on/off, no water movement, nothing. What damage have i caused? Is it the spider gasket? What should i do

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