The Fisher 3990 Atmospheric Vacuum Breaker – 45 Ledge Mount – 1/2″ M Inlet is a precision-engineered component designed for optimal performance in fluid control systems. This vacuum breaker is specifically crafted to prevent back-siphonage, thereby safeguarding water supplies from contamination. It features a 45-degree ledge mount, which facilitates easy installation and integration into various plumbing configurations. The 1/2″ male inlet is compatible with a wide range of standard plumbing fittings, enhancing its versatility across different setups. This product is particularly valuable in industries where maintaining water purity is critical, such as in food service, healthcare, and laboratory environments. The Fisher 3990 is constructed with materials that ensure durability and long-lasting reliability, making it a cost-effective solution for facilities seeking to uphold stringent safety and hygiene standards. Its straightforward design not only promotes ease of use but also ensures minimal maintenance, contributing to reduced operational downtime. The Fisher 3990 Atmospheric Vacuum Breaker represents a trusted solution for professionals requiring a dependable mechanism to prevent the reverse flow of contaminated water into clean water supplies, aligning with rigorous regulatory compliance in diverse applications.