Champion 1/2 in. D X 6 in. L Sprinkler Head Lock - Ace Hardware

Champion 1/2 in. D X 14.5 in. L Spray Head Cap

Rain Bird 1/2 in. D X 2.5 in. L Sprinkler Head Lock

Mueller - 169-510 - Flexible 1/2 in. MPT x 1/2 in. Dia. FPT

STZ Industries - 301U114X6 - 1-1/4 in. MIP each X 1-1/4 in.

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visual-search/test/sample-data-larger.txt at master · awslabs/visual-search · GitHub

Champion 1/2 in. D X 7.5 in. L Sprinkler Head Lock

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Brooks EP600 Fire Sprinkler Head Solid Escutcheon Cup - 1/2 ID – Bass United

Victaulic FireLock™ Series FL-QR/DRY Sprinklers - Dry Fire Sprinklers

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Brecco, Heavy Duty Sprinkler Guard for 1/2 Sprinklers, 2 Pieces, Chrome or Red - Century Fire Protection

Brentford's Local Web site