Pentair American Products 51008400 five spoke spider gasket, 6 inch outside diameterPentair American Products 5 Spoke Spider Gasket, 6" OD, 51008400 In stock$3199
Pentair American Products 51008400 five spoke spider gasket, 6 inch outside diameter
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Pentair American Products 5 Spoke Spider Gasket, 6" OD, 51008400

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$3199
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Quick overview

  • Five spoke pattern The five spoke gasket used after 1976, not the earlier pattern.
  • Measured fit 6 inch outside diameter and 1 inch inside diameter.
  • Fits 501501 and 501601 Made for the Pentair American Products 1-1/2 inch side mount multiport valves.
  • Stops port to port bleed A worn spider gasket lets water cross between ports, so the filter never fully backwashes and water escapes to waste.
  • Genuine Pentair Factory part 51008400.
  • Seat it properly A little sealant or lubricant helps the gasket bed evenly into the valve body.
Full description and specifications ↓

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Product details

The Pentair 51008400 is the five spoke spider gasket for Pentair American Products 1-1/2 inch side mount multiport valves, models 501501 and 501601. It measures 6 inches on the outside and 1 inch on the inside, and it is the pattern used on valves built after 1976.

Count the spokes before you order

American Products used more than one spider gasket pattern over the years, and they are not interchangeable. Take the old one out and count the spokes. Five spokes means this part. Check the outside diameter too, since 6 inches is what confirms it.

Why they fail

The spider gasket is what keeps each port of a multiport valve separate from its neighbors. As the rubber compresses and hardens, water starts crossing between ports inside the valve. The classic symptoms are a trickle out of the waste line while the valve is set to filter, or a backwash that never seems to finish clearing. Both are the gasket, not the filter.

Fitting

Clean the gasket channel in the valve body out completely before seating the new gasket, and press it in evenly all the way around. A silicone sealant or lubricant helps it bed in and stay put while the valve goes back together.

Specifications
Brand Pentair
Manufacturer part number 51008400
UPC 788379693466
Type 5 spoke spider gasket
Part type Filter valves part
Pattern 5 spoke, after 1976
Outside diameter 6"
Inside diameter 1"
Fits Pentair American Products 1-1/2" side mount multiport valves 501501 and 501601
Shipping weight 0.5 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

Which valves does this fit?
Pentair American Products 1-1/2 inch side mount multiport valves, models 501501 and 501601.
How do I know I need the five spoke version?
Count the spokes on the old gasket. This is the five spoke pattern, used on valves after 1976.
What size is it?
6 inches outside diameter and 1 inch inside diameter.
What happens when a spider gasket wears out?
Water bleeds between ports inside the valve. The usual signs are water running to waste while the system is filtering, or a backwash that never runs clear.
Ask your own question