Pressure Balance Shower Cartridge for Sigma Faucet 18.30.893

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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

WHAT OUR CUSTOMERS SAY…

“Outstanding fast delivery on two pieces of an ancient Wolverine bath stem for Kohler - from the early 40s I think. The new one has a different body design, but it screwed directly into the old hot/cold tree and was the exact 6" length. Forty eight hours after installation now, and all remains fine. Also, kudos to the people who set up the website and ordering process. Great work - clear photos and info ! PS: I'm not an employee or family...lol. I retired from electrical wholesaling here outside Chicago and I appreciate a good job. ”

-JM C.

07/31/2026

$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.

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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.