sinks not draining

28 Oct 2006
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United Kingdom
Have two kitchen sinks and hand wash basin drainage plumbed into a toilet stack in a cafe, their is no problem with fall off pipes or blockage but sinks either drain slowly or not at all. I think the problem is the internal stack on the toilet, it is a short drainage pipe with no vent "thinking this is my problem" any suggestions was thinking of fitting a auto airvent?????
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yes and just taken the end cap off the soil pipe to act as a vent and sink still did not drain. HMMM
have you plunged the sinks(s) ? there could be a blockage somewhere partially that is slowing down the flow away.
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