Plumbing Question - Seacock to Head

Vented loops are required (by your insurance company) to protect the boat from sinking if the toilet or other components of the sanitation system (treatment unit, etc.) are below the waterline. If toilet and other components are well above the waterline, there's no need for a vented loop.
 
My vented loop is in the discharge side after the LectraSan and before the thru hull valve.
Is this ok Vic?
 
One quick point even if the intake hose were to split or deteriorate you can shut the seacock valve. When leaving the boat make sure it is closed. I'm so glad I converted to a fresh water system no more odors, I did change the tank and hoses with top quality Sealand hoses and the tank was a thick Poly 45 gallon tank. I am also lucky the head is well above the waterline, but it's a closed fresh water intake and the Y valve is always to the tank. Vic in a few months the new Raritan Vortex Vacu head will be installed I will do a write up and comparison to my current Vacu-Flush system. I am pretty happy with the Vacu-Flush but there is a whole thread on why I am changing. I was getting tired of boiling a 1/2 gallon of scalding water to break up the #2 before flushing on the Admiral. It's the drugs she is on for daily migraines and headaches on top of the migraines. Regards Bill
Bill
 
I have all sanitation valves closed when not onboard and a note taped on the toilet to remind me that valves are closed. The "Y" gate is lined up to the tank.
 
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