Quote:
Originally Posted by sailingdog
The one exception to this that I can think of is the Lavac heads...which have something that resembles a vacuum break on their supply line.
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Yes! I have a Lavac head and an anti-siphon on the supply hose is necessary. On any other head, though, wouldn't you want an anti-siphon on the supply hose as well? Even if it is redundant it would be a nice security back-up. The hose fills with water from the thru-hull to the head so the possibility of siphoning water directly to your head exists.
As far as pumping water to the head past an anti-siphon it is no problem. The hole is not big enough for water to pass through, just big enough to bleed in some air to break the siphon lock created during pumping.