inline breather for 1" Sink Drain

Here is my set-up. I think the relatively long shallow almost horizontal pipe section before the seacock is not helping?View attachment 62394

You could improve things quite a bit by moving the sea clock to a position vertically below the sink. This would reduce the length of pipe and cut out the bend which causes extra loss and also could trap debris. It would also make rodding/ brushing out easier.
 
The seacock has a 90-degree bend on with quite a long tail - which is asking for problems.

My V27 had a straight tail on the seacock just change the 90 degree one for a straight one, you are beginning to give the information as to where the problem lies, it's blocked with crud!
 
You could improve things quite a bit by moving the sea clock to a position vertically below the sink. This would reduce the length of pipe and cut out the bend which causes extra loss and also could trap debris. It would also make rodding/ brushing out easier.

Unfortunately, I have a severe allergy to holes below the waterline...
 
My V27 had a straight tail on the seacock just change the 90 degree one for a straight one, you are beginning to give the information as to where the problem lies, it's blocked with crud!

Yes the seacoks are new and not installed under my owneship. I can't think why seacoks with a 90 degree bend were used. In addition the location forward of the sink is strange too.
 
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