Larry wrote:
Boeland wrote in news:4921bc34$0$14489$5fc30a8
@news.tiscali.it:

Can a vacuum release be added to let the air in the bowl?



I don't understand this vacuum problem. Just pull on the cover and it
bends to leak air into the bowl. It's no problem at all on the one I used.
It's not like it's sucked flat and noone can open it. There's a hissing
sound when you pull on it and the vacuum is released. The idea of LEAVING
IT SEALED is WELL worth any trouble opening it......THERE's NO SMELL AT ALL
IF ITS SEALED SHUT!

There's also no "seawater smell" wafting up when water is left in it, even
shut with no vacuum on it....that's great, too!

The issue is that a considerable vacuum is created while pumping. There
should be a pinhole in an intake line loop to serve as a anti-siphon
vacuum break. This also bleeds off the vacuum in the bowl, and allows
the bowl to fill after pumping, but how fast this happens depends on how
far the bowl is from the loop and the size of the hole. With no
pinhole, it can be impossible for someone unfamiliar with the system to
open it; as I said I can usually pry mine pretty easily but my kid can't
do it within 10 minutes of a pump.