sink drain

[jls1948]

I need to know if anyone can explain why a sink will drain very slow and sometimes not at all but when I loosen the J trap it drains very well what am I not understanding

[gear junkie]

Are you loosening it enough where water is coming from the slip nuts? Whatever you do--NO CHEMICAL DRAIN CLEANERS. Bad stuff.

[Drain Medic]

Possibly venting problems???

[drtyhands]

Possibly venting problems???
Good point Greg.Once had a toilet that was flushing slow because a birdsnest had fallen into the roof vent and had packed leaves over time.

Removed the debris and it flushed like is supposed to.

[westcoastplumber]

Have someone stand down by the kitchen sink and run a garden hose down the vent, the person standing by the sink will watch the sink tomake sure it isn't overflowing.

I saw something the other day which I have never seen before, whoever installed the tube trap stuck a 11/4 x 11/2 t.p washer where the weir of the trap and the waste arm connect, removed that, and the sink went down great.

Something to look at.

[All Clear Sewer]

Sounds like there is no Vent to me ;)