• Pentair R172319 Rainbow #128 Bottom O-Ring White Background
  • Pentair R172319 Rainbow #128 Bottom O-Ring White Background showing size
  • Pentair R172319 Rainbow #128 Bottom O-Ring Blue Background
  • Pentair R172319 Rainbow #128 Bottom O-Ring Grey Background
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Pentair

Pentair R172319 Rainbow #128 Bottom O-Ring

Pentair R172319 Rainbow #128 Bottom O-Ring

$3.99 USD
$3.99 USD
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If your Rainbow chlorinator cap has started leaking water around the seal, its likely that your chlorinator cap O-ring has gone bad. This O-ring is exposed to constant chlorine, making it a commonly replaced part. 

Who is this for?

Pool owners who are running a Rainbow feeder and see a slow drip at the cap. Pool techs check this o-ring for troubleshooting pressure loss in the feeder. Its a cheap, easy to install OEM replacement gasket.

*Always confirm the model of your product for compatibility before ordering any part. Please call Shasta Pool Supply if you are not sure and we will be happy to help.*

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Key Features

  • Genuine replacement part for compatible Pentair Rainbow systems
  • Pentair Rainbow part number: R172319
  • O-ring size/designation: #128
  • Helps create a reliable seal at the bottom connection Ideal for replacing worn, damaged, flattened, or leaking O-rings
  • Suitable for pool and spa equipment maintenance

Technical Specifications

  • Brand: Pentair
  • Part Number: R172319
  • O-Ring Size: #128
  • Part Type: Bottom O-Ring
  • Application: Pool and spa equipment
  • Function: Replacement sealing ring
  • Use: Helps create a secure, leak-resistant seal
  • Replacement For: Worn, cracked, flattened, or damaged O-rings
  • Compatibility: Fits select Pentair Rainbow equipment—please verify your model before ordering

Specs

Shasta Pools Celebrating Sixty Years

Pro Tip: Pentair Rainbow #128 Bottom O-Ring R172319

Owners of similar Rainbow cap seals report the factory o-ring stretches with age, producing a drip after a few years of service. A copy running even a few millimeters oversized bunches under the cap instead of sealing flat. The genuine part number avoids that guesswork.

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What our customers are saying

Fast ship, salt cell was vital to get replaced! Thank you

Stacie S

Works great. Fast shipping

Tim T

Very good service and I will be back, thanks Chuck

Scott H.

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