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Old 24-12-2014, 01:47   #31
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Re: Holding Tank Pump Out

Don't rely on the check valve in the OVB hand type pumps, to keep your tank from back filling.


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Old 24-12-2014, 11:20   #32
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Re: Holding Tank Pump Out

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Originally Posted by Boatyarddog View Post
Don't rely on the check valve in the OVB hand type pumps, to keep your tank from back filling.


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What is an OVB hand type pump??

All of the hand bilge type pumps I'm aware of have an inlet and an outlet valve--two check valves in series to prevent backflow. If one of the valves fails, the pump won't pump (meaning it is likely to get fixed), but it still won't backflow.
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