Equipping your system with our vented loops prevents fluid siphoning between tanks. Commonly employed in marine toilet and engine cooling systems, these loops feature a straightforward valve system at the top that admits air when not in use but seals efficiently as water or other fluids pass through. Crafted from Marelon, both the vent and loop resist corrosion. The duckbill one-way valve ensures proper sealing even with particulate matter present in fluids.