I pulled one of these off during a project, but am struggling to figure out how I can reattach it. There are 3 clips and the cover.
The sprinkler heads appear to be Viking VK457.
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The cover appears to be a two-piece design. The yellow brass-colored "top hat" shaped part that's still on the ceiling is supposed to remain attached to the white-painted disk. The two parts should not have separated when you pulled the cover off. Wiggle that top hat/collar part down off the sprinkler body -- I think it's just a friction fit, but turning it in a counter-clockwise direction wouldn't hurt just in case the part is threaded.
I'm not completely certain whether the collar and the painted disk are supposed to be permanently attached or whether they're intended to separate in case of fire/sprinkler activation. Out of an abundance of caution I'd assume the latter and buy a new cover. They surely must be available online. If you live in a metro region of any size there must also be fire suppression or fire sprinkler contractors in your area. I'd expect that if you telephone one and and sound knowledgeable and confident when you say "hey, I need a white painted cover for a VK457 head" they'll be happy to sell you a new part.
Greg Hill
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