Jabsco 1" Vented Loop is an anti-siphon safety device designed for below-waterline marine toilets. It provides reliable protection against siphoning in rough seas or when the boat lists, and it’s compatible with both manual and electric toilets to safeguard your marine sanitation system. 
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Compatibility: Works with both manual and electric marine toilets installed below the waterline, including static and heeled conditions.
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Vent/Anti-Siphon Design: Durable vented loop that prevents siphoning and protects your sanitation system in challenging sea states.
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Installation: Simple integration into standard 1" plumbing lines for straightforward retrofits or new installs.
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Construction: Built for marine environments with durable materials designed to withstand vibration, salt spray, and temperature changes.
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Manufacturer Part Number: 29015-0020 (Jabsco).
By preventing siphoning, the Jabsco 1" Vented Loop helps maintain toilet performance and protect your marine sanitation system in rough seas, during heavy lists, or on long passages. Its compatibility with both manual and electric toilets and its easy integration into standard 1" plumbing make it a practical upgrade for below-waterline installations on vessels that require reliable anti-siphon protection.