Home Repair (alt.home.repair) For all homeowners and DIYers with many experienced tradesmen. Solve your toughest home fix-it problems.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
jack
 
Posts: n/a
Default Q re Brass Compression Fittings

I have a question for the experts regarding the all brass (metal to
metal) compression fittings as used on the water supply lines to the
behind the tile, shower & tub valve sets.

Briefly, is there a right or wrong way to install these things?

In our remodel, the contractor's plumber installed the rough-in valve
sets, then was called back when we discovered a leak from the fittings
on one set. He added more teflon tape to the compression fitting
threads and reinstalled. Still leaking. He cranked down harder and
managed to pull the nipple right through the nut, shearing the brass
shoulder inside the nut. He then declared the valves defective.
These are NOT cheap valves (EXPO Dolphin brand).

There were 2 identical sets installed, tub & shower. Later we found
the other set also leaking. At that point, I had the remaining valve
set removed & the pipes temporarily capped.

I'm now having problems with EXPO on warranty return because the
plumber apparently threw out the bottom parts of the fittings.

I'd appreciate comments. My suspicion is that the plumber has more
muscle than brains or experience, but I'm not an expert. Probably not
likely we can prove one way or the other, if it even comes to that.
Since then, I've inspected similar fittings on known brands; some were
more robust looking but others were essentially identical to the
failed valves.

Is it common practice to use teflon tape on these fittings? Seems to
me that if that's needed to stop a leak, the game's already lost & the
teflon may only be a short term fix since the seal is not supposed to
be at the threads. I have no desire to criticise someone's work, but
I don't want time bombs installed in my walls either.

Thanks for any help,
Jack

  #2   Report Post  
JTM
 
Posts: n/a
Default Q re Brass Compression Fittings


"jack" wrote in message
...
I have a question for the experts regarding the all brass (metal to
metal) compression fittings as used on the water supply lines to the
behind the tile, shower & tub valve sets.

Briefly, is there a right or wrong way to install these things?

In our remodel, the contractor's plumber installed the rough-in valve
sets, then was called back when we discovered a leak from the fittings
on one set. He added more teflon tape to the compression fitting
threads and reinstalled. Still leaking. He cranked down harder and
managed to pull the nipple right through the nut, shearing the brass
shoulder inside the nut. He then declared the valves defective.
These are NOT cheap valves (EXPO Dolphin brand).

There were 2 identical sets installed, tub & shower. Later we found
the other set also leaking. At that point, I had the remaining valve
set removed & the pipes temporarily capped.

I'm now having problems with EXPO on warranty return because the
plumber apparently threw out the bottom parts of the fittings.

I'd appreciate comments. My suspicion is that the plumber has more
muscle than brains or experience, but I'm not an expert. Probably not
likely we can prove one way or the other, if it even comes to that.
Since then, I've inspected similar fittings on known brands; some were
more robust looking but others were essentially identical to the
failed valves.

Is it common practice to use teflon tape on these fittings? Seems to
me that if that's needed to stop a leak, the game's already lost & the
teflon may only be a short term fix since the seal is not supposed to
be at the threads. I have no desire to criticise someone's work, but
I don't want time bombs installed in my walls either.


The threaded nut on compression fittings is only intended to compress the
ferrule around the tubing and to hold in place against the fitting--the threads
are not part of the sealing system.

Threads designed for sealing are tapered. When I've had compression fitting
problems they are usually caused by misalgnment or undersized tubing which
allows the ferrule to cock as it is being compressed. I have never succeeded in
getting a leaker to seal without just cutting off the spent ferrule and
replacting it with a new one.

Regards,

John


  #3   Report Post  
jim
 
Posts: n/a
Default Q re Brass Compression Fittings

jack wrote:

I have a question for the experts regarding the all brass (metal to
metal) compression fittings as used on the water supply lines to the
behind the tile, shower & tub valve sets.

Briefly, is there a right or wrong way to install these things?

In our remodel, the contractor's plumber installed the rough-in valve
sets, then was called back when we discovered a leak from the fittings
on one set. He added more teflon tape to the compression fitting
threads and reinstalled. Still leaking. He cranked down harder and
managed to pull the nipple right through the nut, shearing the brass
shoulder inside the nut. He then declared the valves defective.
These are NOT cheap valves (EXPO Dolphin brand).

There were 2 identical sets installed, tub & shower. Later we found
the other set also leaking. At that point, I had the remaining valve
set removed & the pipes temporarily capped.

I'm now having problems with EXPO on warranty return because the
plumber apparently threw out the bottom parts of the fittings.

I'd appreciate comments. My suspicion is that the plumber has more
muscle than brains or experience, but I'm not an expert. Probably not
likely we can prove one way or the other, if it even comes to that.
Since then, I've inspected similar fittings on known brands; some were
more robust looking but others were essentially identical to the
failed valves.

Is it common practice to use teflon tape on these fittings? Seems to
me that if that's needed to stop a leak, the game's already lost & the
teflon may only be a short term fix since the seal is not supposed to
be at the threads. I have no desire to criticise someone's work, but
I don't want time bombs installed in my walls either.

Thanks for any help,
Jack

if you have a general contractor doing the job, let him deal with the
plumber, that is his job... if the plumber ruins the fittings, the
general contractor has to make good with another plumber to get the job
done.....
Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Gas compression fittings - how to make good? Steve North UK diy 11 June 15th 04 02:33 PM
Joining 22mm compression fittings to brass pipe Ken Adam UK diy 11 May 15th 04 07:20 PM


All times are GMT +1. The time now is 08:14 PM.

Powered by vBulletin® Copyright ©2000 - 2023, Jelsoft Enterprises Ltd.
Copyright 2004-2023 DIYbanter.
The comments are property of their posters.
 

About Us

"It's about DIY & home improvement"