Pentair Rainbow #128 Bottom O-Ring | R172319
Pentair
SKU: R172319Z
Pentair Rainbow Bottom O-Ring #128 (Diverter Tee Seal) | R172319
The Pentair Rainbow R172319 is the bottom O-ring (#128) used to seal the internal diverter tee/sleeve connection in select Pentair Rainbow in-line chemical feeders. Replacing this O-ring helps stop internal bypass and small leaks that can cause inconsistent chlorine/bromine output, air intrusion, or water seepage around the feeder body.
Compatibility
- Fits: Pentair Rainbow in-line automatic feeders Model 320 and Model 322
- Used at: Diverter tee to sleeve / internal bottom seal location (as specified on the feeder parts diagram)
- Also seen as: R172319Z (revision/replacement part number in some listings)
What This O-Ring Does
- Creates a watertight seal at the diverter tee/sleeve connection inside the feeder
- Helps maintain consistent sanitizer feed by preventing internal leakage or bypass
- Reduces the chance of air being pulled into the system from a compromised internal seal
Common Signs It Needs Replacement
- Feeder output becomes inconsistent even after adjusting the control dial
- Water seepage around the feeder body after opening/servicing the unit
- O-ring is flattened, swollen, brittle, cracked, or nicked
- Difficulty resealing the feeder properly after tablet refills
Specifications
- Brand: Pentair / Rainbow
- Part Number: R172319
- O-Ring Reference: #128
- Part Type: Bottom O-ring / diverter tee seal
- Quantity: Sold individually
Installation Notes
- Shut off the pump and relieve system pressure before opening the feeder.
- Remove tablets and drain/flush the feeder as needed for safe handling.
- Disassemble to access the diverter tee/sleeve area; remove the old O-ring and clean the groove thoroughly.
- Lightly lubricate the new O-ring with silicone lubricant (never petroleum-based) and seat it evenly without twisting.
- Reassemble, restart the system, and inspect for leaks and normal feeder operation.
Related Products
- Rainbow 300/320/322 Lid O-Ring (R172009)
- Silicone Lubricant for O-rings and seals (R172036Z)
- Pentair Rainbow Model 320 parts
- Pentair Rainbow Model 322 parts
- 1/2" feeder tubing, nuts, and fittings
Maintenance Tips
- Keep feeder O-rings clean and lightly lubricated to prevent pinching during reassembly.
- Avoid over-tightening lids and fittings; excessive force can deform sealing surfaces and shorten O-ring life.
- Maintain balanced water chemistry—high pH and high calcium can increase scaling that stresses internal seals.
- If the feeder is exposed to freezing temperatures, winterize properly to reduce crack and seal damage.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 8:00 am to 4:00 pm Phoenix Time
Saturday and Sunday: Closed
- Orders costing more than $300 WILL be required to have signature confirmation upon delivery.
- Handling time is typically only 1 day.
- Any item ordered after 1pm Phoenix time, may not ship same-day.
- Call us if you require expedited shipping and we can give you quotes based on your needs.
Return Policy:
- All products, except as noted below, are eligible for return up to 30 days after receipt of item.
- For returns, an RMA form must be filled out HERE or customers can call for additional help.
- Shipping costs will be deducted from all returned items.
- Any item that is missing accessories, original packaging, or is not returned in the same condition that it was received in, may be subject to a re-stocking fee up to 100% based on the condition we receive it in.
- Items broken, damaged, or inoperable due to installer error will not be refunded.
- Fill out the return form or give us a call to obtain an RMA and return shipping label.
- There are no returns on the Pentair Colorsync 618031
- No returns on pool cleaners.
- No returns on opened seals and o-rings.
- No returns on capacitors.
- If a light is returned because it "doesn't work" and it tests fine, the cost to ship and a re-stocking fee will be deducted from the refund.
- All products denied upon arrival at customers house WILL be charged the cost to ship.
- Visa Gift Card Promotions: Gift cards are sent within 14 days of the order. When accepting the Visa Gift card, you agree that if your order is returned or refunded, this amount will be deducted from the refunded amount. All Visa Gift cards are sent via email in an E-Gift Card format and are non refundable.
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