What I was always thinking. When you consider the tiny jet holes, location of the nozzle in the tank, the vent, routing or our pex (above tank level after nozzle), there is just no real way it'll siphon. Been gutting them for 7 campers and never a problem, even without the external anti siphon valve.
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John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.