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Pressure Balance Shower Cartridge for Sigma Faucet 18.30.893

Tan plastic cartridge with blue top red limit stop brass stem black rubber o-ring and black rubber seal.
Pressure Balance Shower Cartridge for Sigma Faucet 18.30.893 - Image 2
Pressure Balance Shower Cartridge for Sigma Faucet 18.30.893 - Image 3
Pressure Balance Shower Cartridge for Sigma Faucet 18.30.893 - Image 4

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“This place is amazing. I live in San Antonio, Texas and there are a few plumbing stores with vintage parts but they never have what I need and the ordering process takes them weeks. I found a rare part at Noels by reverse image search but they will do it for you. I've used them 3 times. Their agents are knowledgable and polite. They will find you the same part or the after market part and get you going on your way. They have 2-3 day shipping. My house was built in the 30's and they know exactly what the after market parts are that I need. I save money and time going to them. I sure wish they were in San Antonio! I will just go directly to Noel's next time - they are LEGENDS! ”
-BP W.
06/21/2026

$46.47

 

The Sigma 18.30.893 cartridge is a pressure balance shower cartridge used in Sigma and Sonoma Forge shower valves to control water flow and temperature. It is specifically designed for use with Sigma pressure balance shower valves purchased from mid-2014 onwards.

We can ship anywhere the US Postal Service ships. For orders being shipped outside the US, please contact us at (888) ASK-NOEL, asknoel@noelsplumbingsupply.com, or via the text widget on this screen.

SKU: 21915-2 Category: Tag:

Are you experiencing a leaking shower head, low water flow, or fluctuating water temperatures? Restore your luxury shower faucet with the Sigma 18.30.893 Pressure Balance Cartridge. This heavy-duty faucet cartridge maintains a steady water temperature even when other faucets are running, protecting from sudden bursts of hot or cold water.

 

18.30.893

 

  • Used in pressure balance style faucets to help maintain a nearly constant water temperature.
  • It is a reversible cartridge; if the hot and cold water are reversed after installation, the cartridge needs to be rotated 180 degrees and reinstalled.
  • For use with Sigma pressure balance shower valves purchased from mid-2014 to present. It also fits certain Sonoma Forge concealed shower valves.
  • 3″ Length
  • Square or regular broach

 

Customer submitted images. 

 

Common questions about this product

Will this item replace the original OEM part? chevron-icon

Yes, this aftermarket part will replace your OEM part. 

Is this the correct item for my application? chevron-icon

If you’re not sure text us a picture 1-888-275-6635 or email us a picture at noelsplumbingsupply@fuse.net.

 

We will make sure you have the right part.

 

 

Is this item the original manufacturer's recommended replacement part? chevron-icon

Yes, this is the OEM recommended part.

chat iconWHAT OUR CUSTOMERS SAY…

“The vacuum breaker on my outdoor spigot failed and Noel's Plumbing was the only placeI could find that had the appropriate mfr. part. I sent a text with photos on Wednesday evening to make sure the part I found was correct. In less than 2 hours later, I had a reply confirming it was the correct part. Placed my order that evening and received the part on Saturday afternoon (about 2.75 days) and my plumbing issue was resolved! I highly recommend - I really appreciated the prompt and pleasant response. ”
-Kimberly S.
04/25/2026
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