How to Replace a Spider Gasket on a Multiport Valve

Written by:  Danny Rhodehamel
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 (3.53 OUT OF 5 STARS ON 19 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.

Step 5

Make sure that the gasket groove is free of water, grease, oils, debris and parts of the old gasket. Use alcohol to degrease. 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 116)

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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

User: Inyopools

Mike - When you take the top handle assembly off (6 screws) you should see a large O-ring just under the lip of the top assembly. See step 4 of "How To Replace a Pool Multiport Valve Spring". The assembly is upside down so the O-ring is on the lower portion of the picture. This O-ring has to be in place and not stretched or damaged to contain the water.

User: Mike

I replaced my SP 714 key cover and handle assembly and tightened the screws evenly and snug, but not too tightly. Water squirted out all around the assembly when I turned the pump on. Should I have used some kind of sealant around the flange before screwing down?

User: Inyopools

removing MPV - If you have an above ground pool, the water to the filter is gravity fed, and in this case you will have to shut off the water to the pump before removing the multiport valve.

User: 

Do I have to block off my pool water going into pump and sand filter before taking off the multiport valve or will releasing the pressure keep the water from coming out when I remove the valve?

User: Inyopools

kpwb - The white washer under the handle might be broken or a portion of your spider gasket might have come out and is getting caught as you rotate the valve. Check your spider gasket. Then check the white washer. See our guide on "How To Replace a Pool Multiport Valve Spring" for instructions on removing the white washer. On your bottom pipe leak, sounds like the connection is leaking. You will probably have to redo the piping to that port to correct the leak. Most manufactures do not sell the labels on the top of the valves anymore. I am trying to build HTG on different labels put haven't got there yet.

User: kpwb

Why is my multi port valve handle so hard to turn now to backwash, rinse and filter? There is a white ring below it. Does that need to be replaced. Also, there is a leak out the bottom pipe when I filter my pool. Will the spider gasket fix this? One more thing, is there a replacement for the actual writing on the very top? Mine is so old I can hardly read it. I just know where back wash, rinse and filter is!! Thanks

User: Inyopools

maimai - Sounds like you may have a suction leak that is building up back pressure in your filter tank. If so this pressure is being released every time you switch settings - backwash. Try this. When you get low pressure again, instead of going through a full backwash cycle, just change the setting from filter to backwash to relieve the pressure. Then reset the handle to filter and see if you have full flow again. If so, look for a suction leak in the pipes and connections going from the pool to the pump. See our guide on "How to Identify and Correct Air Leaks". Please let me know if this solves your problem.

User: maimai

My equipment works great after backwashing but water going into pool looses pressure about every hour. I backwash and pressure is great but slowly gets weaker and weaker and have to backwash every hour to keep water going into pool at a good pressure. Do i need to replace any gaskets or o-rings? please help, summer half over and haven't been able to use pool yet! thanks

User: Inyopools

RBW - No, you do not have to drain the tank. The water in the tank may be under pressure. All you have to do is open the relief valve and the water will spray out for 5 to 10 seconds until the pressure is released.

User: RBW

When you say release all pressure from the system, does that mean empty the water from the filter tank before we begin?

User: Inyopools

rcole727 - It's not clear how you concluded. If you haven't already, take the handle off again and rotate it 180 degrees before you re-pin it. This will solve your settings problem.

User: rcole727

No, I didn't purchase new key assembly...I removed the valve handle to install a new white plastic "gasket" placed between key assembly and bottom of handle and then replaced the handle with pin.

User: Inyopools

rcole727 - It sounds like the handle on your multiport valve is installed 180 degrees off. When you replaced the gasket filter, did you have to buy and replace the key assembly with the gasket pre-glued? If so, you had to take the handle off the old key assembly to replace it. It is possible that when you replaced the handle, you flipped its position so that the filter operations are reversed - filter = backwash; waste = recirculate; closed = rinse. See our guide on "How To Replace a Pool Multiport Valve Handle".

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