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373 Holding Tank

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Anonymous (not verified)
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373 Holding Tank

I hope someone on this site can help.
Could you tell me if the 373 holding tank has a non-return valve on the waste pipe to sea? I can not see anything obvious, but it maybe part of the elbow to pipe connection at the bottom of the tank.

The reason I ask is that the tank is blocked and so far I have not been able to clear it. I have tried pumping air back up the outlet pipe but with no joy. Hence the question regarding non-return valve.

Any suggestions are more than welcome.

Thanks

Kevin

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