Thermostatic Cartridge for Altmans & Sigma THEXCART 18.30.155

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Bright brass cartridge with black rubber o-rings stainless steel screen and copper thermo.

WHAT OUR CUSTOMERS SAY…

“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

$180.47

The Altmans & Sigma THEXCART & 18.30.155 is a thermostatic shower valve cartridge used to stabilize water temperature and provide anti-scald protection. It is a replacement cartridge for several luxury shower systems, most notably the Sigma Simply Safe series and Altmans 8000 Series faucet bodies.

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.

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Restore flawless temperature control to your luxury shower with the high-performance Thermostatic Cartridge for Altmans & Sigma THEXCART 18.30.155. Engineered as a premium, direct-fit replacement for the Sigma Simply Safe 18.30.155 shower valve body, this heavy-duty brass cartridge eliminates erratic temperature swings, leaks, and poor water pressure. Designed for both professional plumbers and DIY home repair enthusiasts, it brings your high-end bath fixtures back to factory-new performance without the expense of a full valve replacement.

THEXCART 18.30.155

3 3/8″ Length
20 point broach

Common questions about this product

Yes, this is the OEM recommended part.

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.

Yes, this aftermarket part will replace your OEM part.

WHAT OUR CUSTOMERS SAY…

“Noel's Plumbing Supply found this place on Google maps. In and out service. The person I was speaking to the desk offered me a selection knew exactly what I needed price was really reasonable. You don't know how much it means to a homeowner to be able to come in without any run around trying to sell you something you don't need. I recommend this establishment to all my family and friends. ”

-Steve C