I believe XHH was a generic industry semi standard marking indicating K8.0 “extra high hazard”, I think XLH was also used for k4.2 “extra light hazard” back before SIN numbers and all the standardization of today. I believe it was a European thing primarily but appears on models from Grinnel, Reliable and Viking at least that I know of. Model was typically stamped on the wrench boss on Vikings IIRC, but with the info you provided and orientation and element type you can probably figure out what it is either way.
Mike Morey 2025 NFSA Top Tech Champion<https://www.linkedin.com/posts/national-fire-sprinkler-association_congratulations-to-our-2025-top-tech-winner-activity-7326725245707431936-_5jg/> • NICET IV<https://credentials.nicet.org/47458792-752e-4926-86fc-bd4d47722218#acc.kBTieRXy> • CFPS<https://www.credly.com/badges/c05de73a-dbed-4c31-b1dc-0be93f3151f0/public_url> Project Estimator • Fire Protection Group Shambaugh & Son, LP an EMCOR Company 7614 Opportunity Drive • Fort Wayne, IN • 46825 direct 260.487.7824 / cell 260.417.0625 email [email protected]<mailto:[email protected]> 24/7<outlook-data-detector://2/> SERVICE LINE 888.217.7055<tel:888.217.7055> [cid:[email protected]] From: Scott Futrell <[email protected]> Sent: Tuesday, August 18, 2026 2:44 PM To: [email protected] Subject: [Sprinklerforum] Viking Sprinkler Data Sheet Good afternoon. Does anyone have a data sheet for a K8, circa 1985, model XHH Viking sprinkler that they would share with me? I cannot find it on the obsolete sprinkler spreadsheet. Thanks in advance, Scott C: 612. 759. 5556 ZjQcmQRYFpfptBannerStart This Message Is From an Untrusted Sender You have not previously corresponded with this sender. ZjQcmQRYFpfptBannerEnd Good afternoon. Does anyone have a data sheet for a K8, circa 1985, model XHH Viking sprinkler that they would share with me? I cannot find it on the obsolete sprinkler spreadsheet. Thanks in advance, Scott C: 612.759.5556 This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient.
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