Pentair Pentek 151122 OR-100 Big Blue EPDM O-Ring
Pentair Pentek 151122 OR-100 Big Blue EPDM O-Ring
Replace a worn or damaged Big Blue housing seal with the genuine Pentair Pentek 151122 OR-100 EPDM O-ring. Fits compatible #10 and #20 Big Blue and PBH filter housings.
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Features & Details
The Pentair Pentek 151122 O-ring provides a watertight seal between the cap and sump of compatible Big Blue and PBH bag filter housings. Constructed from durable EPDM rubber, it is an essential replacement for an O-ring that has become flattened, cracked, stretched or damaged.
Product specifications
- Pentair part number: 151122
- Also known as: OR-100 / Big Blue O-ring
- Material: EPDM (per Pentair Big Blue and PBH specification sheets)
- Compatibility: Pentek #10 and #20 Big Blue / Big Black housings and PBH bag filter housings
- Approximate dimensions: 5.5-inch inside diameter × about 5.8-inch outside diameter
- Cross-section: Approximately 0.165–0.18 inch
- Not compatible with: Big Clear housings or Standard / Slim Line housings (those use other O-ring part numbers such as 151120 or 151121)
Maintenance tips
Inspect the O-ring for cracks, tears, stretching or flat spots whenever the filter cartridge is replaced. Before installation, clean the O-ring groove and apply a light coating of food-grade silicone lubricant. Make sure the O-ring is seated evenly and is not twisted or pinched.
Tighten the housing sump only until it is securely sealed. Over-tightening can damage the O-ring or make the housing difficult to open during the next filter change.
Important: Confirm the housing model or existing O-ring part number before ordering. This O-ring is designed for Big Blue / PBH housings, not Standard Slim Line housings.

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FAQs
How do I cancel or edit an order?
How do I cancel or edit an order?
Unfortunately, we cannot cancel orders due to a change of mind. However, we understand that mistakes happen. If you need to edit your order information, such as the delivery address or contact number, please contact our customer service as soon as possible.
Here’s what you can do:
- Contact our customer service via email address, or Live Chat.
- Have your order number ready when contacting customer service.
- We cannot guarantee changes to orders after 24 hours of placement. This is because orders may be processed once received
How can I track my order?
How can I track my order?
You can track your order by checking the shipping confirmation email, which contains a tracking number and a link to the courier's website. Alternatively, log in to your account on our website, navigate to "My Orders," and click on the tracking link provided for your order.
What if there is a problem with my order?
What if there is a problem with my order?
If there is an issue with your order, please contact our customer service team as soon as possible. You can reach us via email, phone, or through the contact form on our website. Provide your order number and a brief description of the problem so we can assist you quickly.
I didn't receive all off my order?
I didn't receive all off my order?
If part of your order is missing, please check the shipping confirmation email to see if the items were sent separately. If all items should have arrived together or if you have concerns, contact our customer service team with your order number. We’ll investigate and resolve the issue promptly.

