Groco HVL-750 Bronze Vented Loop 3/4 Inch Hose Marine Anti-Siphon Valve

The Groco HVL-750 is a bronze vented loop designed for marine sanitation and plumbing systems to prevent siphoning and backflow. This critical component creates an air break in waste discharge lines, protecting against contamination of freshwater systems and preventing seawater from siphoning back into holding tanks or toilets.

Key Features:

• Oversized vent valve design is virtually clog-free for reliable long-term performance
• Tool-free maintenance - threaded cap unscrews for easy inspection and cleaning
• Durable bronze construction resists corrosion in harsh marine environments
• 3/4 inch hose barb connections for secure attachment
• Cap features 1/2 inch NPT thread for optional overboard venting configuration
• Compact design allows flexible mounting in tight engine room spaces

The HVL series vented loop meets ABYC standards for anti-siphon protection and is an essential safety component for marine head systems, galley sink drains, and other below-waterline discharge applications. The easy-clean design minimizes maintenance time and ensures consistent operation season after season.