How on earth do you install these on sprinkler heads that are already in place?

If is comercial tipe sprinkler like Big head must shot off main water valve by the street and drain out all the water have a drain valve by the main shot off valve interior off the house If is recidential yes Remove down the plate and Install it

ASIN	B08CDZ9CBQ
ASIN	B08CDZ9CBQ
Batteries Included?	No
Batteries Required?	No
Color	White
Customer Reviews	4.5 4.5 out of 5 stars (201)
Customer reviews	4.5 4.5 out of 5 stars (201)
Date First Available	31 October 2021
Date First Available	31 October 2021
Item Weight	410 g
Item model number	SEW12
Item model number	SEW12
Manufacturer	Happy Tree
Manufacturer	Happy Tree
Material	Iron
Package Dimensions	16.3 x 16.1 x 8.1 cm; 410 g
Package Dimensions	16.3 x 16.1 x 8.1 cm; 410 g
Part number	SEW
Size	1/2"IPS-(12 Pack)
Style	Ring

Happy Tree (12 Pack) 1/2" IPS Fire Sprinkler Head Escutcheon Plate 3/4" Adjustment Range Recessed Two Piece Rosette Cover Trim Ring White Fire Sprinkler Covers for Ceiling

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