Based on this product's specifications, here are some alternatives and similar models
Anti-pollution valve ARCO model 191104, 3/4" female thread x 3/4" female thread
Summary description:
ARCO anti-pollution valve model 191104 is a plumbing component with 3/4" female (GW) inlet and 3/4" female (GW) outlet. Designed to prevent backflow and contamination of potable water systems, it is suitable for installation in household and small commercial water lines. Use cases include protection of drinking water from cross-connections, irrigation line safety, and general backflow prevention.