houghn
regular
Reged: 20/04/2004
Posts: 2717
Loc: Birmingham-sur-Mer
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I think so. I know of one that paid up when a poly bag got sucked into the inlet and achieved the same end result. I also know of one where the sea cock was left open, and the inlet pipe on a plastic strainer snapped off and partially sank the boat, and they paid up then as well.
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jfm
regular
Reged: 16/05/2001
Posts: 7165
Loc: London/Antibes
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Yes I have checked them thoroughtly and recently! Passed my "MOT" (MCA inspection) 2 weeks ago! I'm not saying one cant break and sink my boat right now while I'm typing this. It's just that that is VERY unlikely, and I'd prefer to take that risk than faff about (twice) with seacocks every time someone wants a pee
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gwylan
regular
Reged: 31/05/2007
Posts: 253
Loc: Portishead, on tour
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Sailors do it over the stern
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gwylan
regular
Reged: 31/05/2007
Posts: 253
Loc: Portishead, on tour
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oops, maybe I should re pharse that......
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Netherlands Chapter of the Bristol Channel forum
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motayotty
regular
Reged: 09/10/2005
Posts: 134
Loc: Somerset
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I have always been led to believe that on a boat underway if it slams the force of the water into an open port could cause it to fail. Hence when travelling at low speeds I will leave them open. For faster modes I will close them.
When unnattended for the aforementioned periods of time they will always be closed. Cant remember who told me but seems to make sense? Close to an old wives tale but suits me sir!
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Oneaway
regular
Reged: 16/12/2005
Posts: 762
Loc: back in the UK
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I know this a bit anorakish of me, but jabsco's intructions state;-
"after every usage, both seacocks (or secondary valves) must be shut, wheneveryour craft is unattended,even if for a very short period of time, both seacocks, (even if secondary valves are fitted)MUST be shut"
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"It's Better to Have Memories Than Dreams"
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Dave3729
regular
Reged: 01/11/2006
Posts: 129
Loc: Hornchurch, Essex
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Being one of the sad people that have to attend work during the week i only visit my boat on the weekends. I could not think of anything worse than lifting up the carpets to turn on the toilet seacocks every weekend and of when i left. I have just had new toilets fitted and left the floor up for a week to make sure of no leaks. They will now stay open until winter.
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Is that land over there ?
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TugWilson
regular
Reged: 01/02/2007
Posts: 462
Loc: Sunny Cumbria
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At the end of the day i suppose its like most things in life its down to personal choice,Whatever your happy with, niether is right or wrong.(or am i wrong?  )
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Never Argue With An Idiot,They Drag You Down To Their Level And Beat You With Experience
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James_Calvert
regular
Reged: 06/10/2001
Posts: 84
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If your heads has a small lever near the pump marked "flush" and "dry" - or words/symbols to that effect, you should return it to dry for the last few pumps, and leave it there when finished. If you don't, water can - and in particular cases will - enter through the inlet seacock. I guess that's one reason why it's held that the best practice is to turn sea cocks off.
For my boat - a raggie with a two tonne keel - the top of the bowl is below the waterline and I woke up early one morning to see a flipflop surfing past about six inches above the cabin sole. Took me over an hour to pump out - I've had a thing about turning off those sea cocks ever since.
I guess the same effect could be achieved in a stinky when planing, depending where the inlet is oriented ie whether it would blow or suck.
Otherwise, at rest, if the heads is above the waterline, I guess the risk of flooding is just from the piping connected to the seacocks. If this is inspected regularly (eg at least annually), and there's no danger of it getting dislodged between inspections, the risk of failure would be very low. Just as well as it's a risk I have to take with my cockpit drains which drain through seacocks below the waterline. If I turned these seacocks off, my cockpit would fill up with rain water when I was away and cause all other kinds of problems.
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Martynk
regular
Reged: 28/12/2004
Posts: 985
Loc: Cheshire, UK
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I sort of tried both - I thought one day I would turn them all off before I left the boat for 4 weeks. Stuck a big sticker on the keys and a yellow sticky note on the dash.
Got back and had trouble turning one of the engine seacocks on, in the end I got it replaced, but i couldnt help feel that leaving them open, and then opening and shutting them everytime I came on teh boat tp keep them moving worked a lot better than leaving it shut. I think lots of rubbish must have built up, preventing it from opening again.
Also I felt a right pillock when the only other time I turned everything off, I forgot to turn the aircon stopcock on, and of course it overheated, so cue new pump. Expensive mistake, so bugger it, I just leave them open now. I asked on the marina, and no one I came across on my pontoon shuts them.
Lets hope that I continue to find that 
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