Advice please. I am connecting a water supply hose to washing machine
but getting a slight leak.

http://www.toolstation.com/images/li...bbig/32532.jpg

The hose is brand new and the rubber seals inside the screw heads are
undamaged. The screw part of the hose and the screw part of the washer
are both plastic.


(1) Is the rubber seal at the end of the hose supposed to be
sufficient to keep the joint water tight?

I do not think I am over-tightening the joint. If anything I may be
under-tightening it as I'm tightening by hand and, at my maximum,
probably could give it another 1/4 or 1/2 a turn.

(2) Is it good practise to use PTFE sealing tape on these screw
joints? Or is the use of tape a sign of a poorly connection?

"Chris S" wrote in message
...
Advice please. I am connecting a water supply hose to washing machine
but getting a slight leak.

http://www.toolstation.com/images/li...bbig/32532.jpg

The hose is brand new and the rubber seals inside the screw heads are
undamaged. The screw part of the hose and the screw part of the washer
are both plastic.


(1) Is the rubber seal at the end of the hose supposed to be
sufficient to keep the joint water tight?

I do not think I am over-tightening the joint. If anything I may be
under-tightening it as I'm tightening by hand and, at my maximum,
probably could give it another 1/4 or 1/2 a turn.

(2) Is it good practise to use PTFE sealing tape on these screw
joints? Or is the use of tape a sign of a poorly connection?

Never used ptfe on a washing machine or dishwasher hose connection at either
end

If any sign of leak at hand tight I normally nip up just a bit with a pair
of water pump pliers

Tony

On Fri, 25 Apr 2008 11:56:40 +0100 someone who may be Chris S
wrote this:-

(1) Is the rubber seal at the end of the hose supposed to be
sufficient to keep the joint water tight?

It is sufficient.

I do not think I am over-tightening the joint. If anything I may be
under-tightening it as I'm tightening by hand and, at my maximum,
probably could give it another 1/4 or 1/2 a turn.

Hand tightening should be enough. If not look at the sealing faces.

(2) Is it good practise to use PTFE sealing tape on these screw
joints?

No.

Take a look at the fitting and think how it prevents the water
coming out. The washer is sandwiched between two faces (one on the
hose and one on the pipework fitting). Putting something on the
thread is not going to do anything useful, as the assembly does not
seal on the thread. If water is coming out then there is a problem
with the washer or one/both of the sealing faces.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

"Chris S" wrote in message
...
Advice please. I am connecting a water supply hose to washing machine
but getting a slight leak.

http://www.toolstation.com/images/li...bbig/32532.jpg

The hose is brand new and the rubber seals inside the screw heads are
undamaged. The screw part of the hose and the screw part of the washer
are both plastic.


(1) Is the rubber seal at the end of the hose supposed to be
sufficient to keep the joint water tight?

I do not think I am over-tightening the joint. If anything I may be
under-tightening it as I'm tightening by hand and, at my maximum,
probably could give it another 1/4 or 1/2 a turn.

(2) Is it good practise to use PTFE sealing tape on these screw
joints? Or is the use of tape a sign of a poorly connection?

Turn the threaded plastic nut until the water stops leaking use mole grips
lightly if needed.
It will stop I promise ya.

On Fri, 25 Apr 2008 11:56:40 +0100, Chris S wrote:

(1) Is the rubber seal at the end of the hose supposed to be
sufficient to keep the joint water tight?

Short answer: Yes.

Long answer: Check that both side of the rubber washer are undamaged and
that the faces it mates against are smooth and that the washer is properly
seated into the hose end before you screw it on. Hand, bit more than just
fingers, tight should be fine.

A this a new, untested, hose there is a possibilty that the crimp between
the hose and fitting is leaking rather than the washer to valve. It might
be hard to tell if the leak appears at the back of the "nut" rather than
from the threads.

(2) Is it good practise to use PTFE sealing tape on these screw
joints? Or is the use of tape a sign of a poorly connection?

May hide the problem rather than curing it. The thread is there to force
the washer against the end of the valve. That is where the seal is not in
the threads.

--
Cheers
Dave.

In an earlier contribution to this discussion,
Chris S wrote:

Advice please. I am connecting a water supply hose to washing machine
but getting a slight leak.

http://www.toolstation.com/images/li...bbig/32532.jpg

The hose is brand new and the rubber seals inside the screw heads are
undamaged. The screw part of the hose and the screw part of the
washer are both plastic.


(1) Is the rubber seal at the end of the hose supposed to be
sufficient to keep the joint water tight?

Yes - provided the sealing faces are good, and provided that there is
nothing preventing the nut from screwing on far enough to compress the
rubber washer. If the nut is bottoming on the threads before nipping the
washer, use a thicker washer.

I do not think I am over-tightening the joint. If anything I may be
under-tightening it as I'm tightening by hand and, at my maximum,
probably could give it another 1/4 or 1/2 a turn.


You may need to turn it a bit beyond hand-tight, using water pump pliers.

(2) Is it good practise to use PTFE sealing tape on these screw
joints? Or is the use of tape a sign of a poorly connection?

Tape is a waste of time. If water is getting past the washer, it will leak
out of the back of the fitting even if you seal the threads (which are not
meant to be sealed, anyway).

P.S. Check that the white plastic bits at each end of the hose are not
cracked. I know it's a new hose, but these cheap tatty plastic bits are all
too easy to damage!
--
Cheers,
Roger
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"Chris S" wrote in message
...
Advice please. I am connecting a water supply hose to washing machine
but getting a slight leak.

http://www.toolstation.com/images/li...bbig/32532.jpg

The hose is brand new and the rubber seals inside the screw heads are
undamaged. The screw part of the hose and the screw part of the washer
are both plastic.


(1) Is the rubber seal at the end of the hose supposed to be
sufficient to keep the joint water tight?

I do not think I am over-tightening the joint. If anything I may be
under-tightening it as I'm tightening by hand and, at my maximum,
probably could give it another 1/4 or 1/2 a turn.

(2) Is it good practise to use PTFE sealing tape on these screw
joints? Or is the use of tape a sign of a poorly connection?

No PTFE tape on plastic screw joints, all it does is deform the threads and
water still leaks.

However I have had instances where a smear of Fernox LS-X on both sides of
rubber washer and even lightly on the thread has finally sealed things.

One hose I couldn't seal was due to a blob of gloss paint on the rear of the
thread of valve, due to when the kitchen was replaced ,that just lifted the
plastic thread off the thread and leaked, Only obvious when I removed the
valve for replacement.

Other than that you can get replacement ends for the hoses that jubilee clip
on if hose replacement is not possible as some appliances the hose
terminates inside the appliance in a manufacturer specific connector.

Thank you to all who replied.