Drain-Tailpiece Leaking

[Chefwong]

I've been scratching me head on this one...I've replaced the DW tailpiece directly off the sink drain twice already. Top Hat Washer as well.
17GA tailpiece . Noticed this again, corrison outside tailpiece - must be coming from the joint between sink drain-tailpiece.

What gives. I think on this round, I'm going to put some dang tape and dope on the nut, just because for good measure

 

[Jeff H Young]

losing me with your words whats leaking? dw tailpiece ? top hat ? what is this kitchen sink ? lav ? I dont know why but Im drawing a blank what your talking about hate to admit it

 

[Sponsor]

 

[Tuttles Revenge]

Maybe switching to Poly Wye branch rather than brass?

 

[Chefwong]

Off the Kitchen sink drain, it's leaking on the DW tailpiece off of it (17awg brass).
Didn't pick up on it till now, but it's got quite a bit of crud/corrision from whatever is slowly leaking from use....
And I've replaced it 2X in the last 5 years as a Wild Guess ? Last time being maybe a year to 16 months ago ?

I gotta do it again, so either I'm not tigheting it enough, or I need to -dope- the threads to let me tighten even more or like TR suggested and this what I am thinking, is don't replace with brass but poly

 

[Tuttles Revenge]

If the leak is coming from the slipjoint connection, then a poly won't be able to be tightened more than a brass/steel nut would. Maybe a softer washer would squish and hold torque better and potentially fill any gaps in the mating surface?

 

[royalflush001]

Use compatible metals (avoid mixing brass & steel).
Seal it up! Teflon tape + dope on the nut threads.
Upgrade the washer: high-quality rubber or double-washer.
Clean regularly: remove corrosion with vinegar/baking soda.

Remember to check for rough edges, use the correct length, and avoid overtightening.

 

[Jeff H Young]

Still dont really get it but a slip joint washer I like are those soft blue rubber ones. This aint rocket science take it apart clean it alighn everything properly and try again sometimes I just tear all that crap out and throw away and for around 6 dollars rebuild it after all all time is money.