Back in the ‘80’s, when VCR’s were new, I supervised the installation of the fire sprinkler systems at the EPCOT Center Living Seas Pavilion, a 5.5-million-gallon fish tank in Orlando, Florida. We had many areas where saltwater would cause sprinkler corrosion, and we installed stainless steel sprinklers (Central brand at the time), but only pendent and upright sprinklers were available in that material. Back then, there were lead-coated corrosion-resistant sprinklers on the market, but that’s no longer available anywhere.
I’d suggest checking with manufacturers, but I doubt you'll be able to find one concealed in stainless steel. Most glass bulb sprinklers are available with Teflon coatings, but I doubt the exposed Belville seal would be protected. I suppose you could ask if a wax-coated concealed sprinkler would be available – the problem is no one would be able to see corrosion problems behind the cover plate when doing visual inspections of the sprinklers in the annual inspections. Good luck! <https://www.dropbox.com/s/g4h8r7hdtsr6154/AFSA_L.png?raw=1> Bob Caputo, CFPS President American Fire Sprinkler Association 1410 E Renner Rd., Suite 150 Richardson, TX 75082 c: 760-908-7753 p: 214-349-5965 ext124 w: <http://firesprinkler.org/> firesprinkler.org New Year, New Training! Learn design, hydraulic calculations, and ITM with AFSA’s best-in-class training! Click here <https://firesprinkler.org/education-training/> to learn more and register now for Beginning Design School, Sprinkler Hydraulics Calculations Course, NFPA 25 Essentials Workshop, and Advanced Hydraulics Calculations Course. From: Fpdcdesign <[email protected]> Sent: Friday, February 13, 2026 11:44 AM To: Sprinklerforum <[email protected]> Subject: [Sprinklerforum] Corrosion resistant concealed sprinklers My day for questions. I am working on a project with a therapy pool that will require corrosion resistant sprinklers above. The Architect is insisting on concealed sprinklers. To date, I have not found anything in manufacturer’s literature that matches. Would a clean room sprinkler (concealed sprinklers with gasket) provide corrosion resistance? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT <tel:860-535-2080> 860-535-2080 (ofc) <tel:860-554-7054> 860-554-7054 (fax) <tel:860-608-4559> 860-608-4559 (cell)
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