Sta-Rite 35505-1429 O-ring for System 3 cartridge filtersSta-Rite O-Ring for System 3 Cartridge Filters, 35505-1429 In stock$1399
Sta-Rite 35505-1429 O-ring for System 3 cartridge filters
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Sta-Rite O-Ring for System 3 Cartridge Filters, 35505-1429

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$1399
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Quick overview

  • Sta-Rite part 35505-1429 The O-ring listed for the System 3 SM cartridge filters.
  • 1-5/8 inch inside diameter Sized so you can check it against the seal you are replacing before ordering.
  • 1/8 inch cross section Standard cross section, the dimension that decides how the ring seats in its groove.
  • Fits four System 3 models Listed for the S7M120, S7M400, S8M150 and S8M500.
  • Cheap insurance O-rings are the first thing to renew whenever a filter is opened, long before they visibly fail.
  • Lubricate on assembly A silicone based O-ring lubricant helps the ring seat and keeps it from being pinched.
Full description and specifications ↓

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Product details

The Sta-Rite 35505-1429 is an O-ring listed for the System 3 SM cartridge filters, measuring 1-5/8 inches inside diameter with a 1/8 inch cross section.

Fitment

It is listed for the System 3 SM models S7M120, S7M400, S8M150 and S8M500. Because the two dimensions are published, you can measure the ring you are replacing and confirm the match before ordering rather than guessing from a picture.

When to change it

O-rings do not usually fail suddenly. They harden with heat and chemical exposure, take a permanent set in the shape of the groove, and then one day the joint weeps. Renewing them whenever the filter is open costs very little compared with chasing a leak later in the season.

Assembly

Clean the groove, wipe the ring, and use a silicone based O-ring lubricant. Lubricant is not there to help it seal; it is there to let the ring slide into place without being pinched or twisted as the parts come together.

Specifications
Brand Sta-Rite
Manufacturer part number 35505-1429
UPC 788379830373
Part type Pool Filter Part
Type O-Ring
Inside diameter 1-5/8 inches
Cross section 1/8 inch
Fits Sta-Rite System 3 SM cartridge filters, models S7M120, S7M400, S8M150 and S8M500
Shipping weight 0.01 lb
Ships Parcel

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Questions and answers

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

What size is this O-ring?
1-5/8 inch inside diameter with a 1/8 inch cross section.
Which filters does it fit?
It is listed for the Sta-Rite System 3 SM cartridge filters, models S7M120, S7M400, S8M150 and S8M500.
Should I lubricate it?
Yes. A silicone based O-ring lubricant helps the ring seat in its groove and keeps it from being pinched or rolled during assembly.
How often should O-rings be replaced?
Any time the filter is opened is a good moment to look. A ring that has gone hard, flat or shiny in one spot has taken a set and will not seal reliably again.
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