R620CT, Anti-Siphon Backflow Preventer, 3/4-Inch FHT X 3/4-Inch MHT, Connects to
Item model number R620CT. The atmospheric vacuum breaker has a 3/4 in. FHT connection which threads onto the hose bibb or faucet; 3/4 in. Use the directional arrow on the device to position in the direction of water flow.