https://www.acehardware.com/departments/lawn-and-garden/watering-and-irrigation/underground-sprinkler-valves/7014328
Hunter PGV Anti-Siphon Valve 1 in. 150 psi Mfr# PGV101ASV - Ace Hardware
With the PGV-ASV, irrigation systems that require backflow prevention for every zone can enjoy simple operation and trouble-free performance without the need...
anti siphon valve
https://www.acehardware.com/departments/plumbing/valves/rough-faucets-and-hose-bibbs/4207130
B&K ProLine 1/2 in. MPT X 8 in. Compression Anti-Siphon Brass Sillcock Valve Mfr# 104-825HC - Ace...
Quarter turn ceramic cartridge. Drains automatically upon water shut off, if the hose is removed or open. Built-in backflow preventer checks siphoning back...