From Newsgroup: uk.d-i-y

John Rumm <see.my.signature@nowhere.null> wrote:

If you can't find an adaptor, you could always do it in steps; convert
from 3/4" BSP TM to compression first, then go from that to something
you can mount your flexi on:

There's no space for anything else, I need to take an immediate turn upward. There is barely enough space for the curve on the flexi as it is.

I haven't managed to find any 3/4" BSPT fittings locally. The reducers Alan mentioned plus an elbow might work, but I'd have to order them in. If I can find a 3/4" BSPT elbow then I have more space to adapt that to 1/2" BSPP.

Jet V2 is non setting - it works as a lubricant, and helps make a final seal. You won't be able to use it at any thickness. So good for threads
on compression joints (reduces squeaking, and requires less torque to tighten), also as a thin film on mating surfaces like cone joints on on olives where it will seal very slight imperfections on the surface.

I've now got some Fernox LS-X, which seems to be basically silicone in a
tube. Is it worth trying to seal what I've got with that, or is it a waste
of time and I'll need to get a BSPT thread?

Thanks
Theo
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From Newsgroup: uk.d-i-y

Roger Hayter <roger@hayter.org> wrote:

At that size a taper thread will seal perfectly with 15 - 20 turns of thin PTFE tape. A parallel thread won't seal without some setting sealant,
unless a fibre washer will fit *over* the male thread and the adapter has
a flat shoulder to meet the plastic round the female thread, but I
wouldn't trust that solution.

Thanks. Today I had to do the same for some 1/2" and I used some of these: https://www.toolstation.com/made4trade-compression-rigid-trv-extension-piece-12/p82760

They have a rubber washer around the outside, which forms a good seal with
the outside of the 1/2" BSPP female threaded piece, and then a compression fitting on the blank end (they're also telescopic, which I thought would
leak but didn't). That's a quite specialist application so there's no equivalent in 3/4".

Theo
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From Newsgroup: uk.d-i-y

Theo wrote:

John Rumm <see.my.signature@nowhere.null> wrote:

If you can't find an adaptor, you could always do it in steps; convert
from 3/4" BSP TM to compression first, then go from that to something
you can mount your flexi on:

There's no space for anything else, I need to take an immediate turn upward. There is barely enough space for the curve on the flexi as it is.

I haven't managed to find any 3/4" BSPT fittings locally. The reducers Alan mentioned plus an elbow might work, but I'd have to order them in. If I can find a 3/4" BSPT elbow then I have more space to adapt that to 1/2" BSPP.

Jet V2 is non setting - it works as a lubricant, and helps make a final
seal. You won't be able to use it at any thickness. So good for threads
on compression joints (reduces squeaking, and requires less torque to
tighten), also as a thin film on mating surfaces like cone joints on on
olives where it will seal very slight imperfections on the surface.

I've now got some Fernox LS-X, which seems to be basically silicone in a tube. Is it worth trying to seal what I've got with that, or is it a waste of time and I'll need to get a BSPT thread?

Thanks
Theo

As I said earlier, I would use a hemp wrap and jointing paste.
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From Newsgroup: uk.d-i-y

On 21 Jun 2026 at 23:04:19 BST, "Theo" <theom+news@chiark.greenend.org.uk> wrote:

John Rumm <see.my.signature@nowhere.null> wrote:

If you can't find an adaptor, you could always do it in steps; convert
from 3/4" BSP TM to compression first, then go from that to something
you can mount your flexi on:

There's no space for anything else, I need to take an immediate turn upward. There is barely enough space for the curve on the flexi as it is.

I haven't managed to find any 3/4" BSPT fittings locally. The reducers Alan mentioned plus an elbow might work, but I'd have to order them in. If I can find a 3/4" BSPT elbow then I have more space to adapt that to 1/2" BSPP.

Jet V2 is non setting - it works as a lubricant, and helps make a final
seal. You won't be able to use it at any thickness. So good for threads
on compression joints (reduces squeaking, and requires less torque to
tighten), also as a thin film on mating surfaces like cone joints on on
olives where it will seal very slight imperfections on the surface.

I've now got some Fernox LS-X, which seems to be basically silicone in a tube. Is it worth trying to seal what I've got with that, or is it a waste of time and I'll need to get a BSPT thread?

Thanks
Theo

I wouldn't trust it permanently, though it would probably work at first.

You can certainly get an adapter 1/2" to 3/4" taper male, the only question is whether the flexi would fit far enough on the taper male 1/2" side. I suspect it would.


https://www.bes.co.uk/3-4in-x-1-2in-hexagon-reducing-nipple-bsp-taper-brass-10596/
--

Roger Hayter
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From Newsgroup: uk.d-i-y

On 22 Jun 2026 at 09:37:33 BST, "Sparky" <"somewhere else"@gmail.com> wrote:

Theo wrote:

John Rumm <see.my.signature@nowhere.null> wrote:

If you can't find an adaptor, you could always do it in steps; convert
from 3/4" BSP TM to compression first, then go from that to something
you can mount your flexi on:

There's no space for anything else, I need to take an immediate turn upward. >> There is barely enough space for the curve on the flexi as it is.

I haven't managed to find any 3/4" BSPT fittings locally. The reducers Alan >> mentioned plus an elbow might work, but I'd have to order them in. If I can >> find a 3/4" BSPT elbow then I have more space to adapt that to 1/2" BSPP.

Jet V2 is non setting - it works as a lubricant, and helps make a final
seal. You won't be able to use it at any thickness. So good for threads
on compression joints (reduces squeaking, and requires less torque to
tighten), also as a thin film on mating surfaces like cone joints on on
olives where it will seal very slight imperfections on the surface.

I've now got some Fernox LS-X, which seems to be basically silicone in a
tube. Is it worth trying to seal what I've got with that, or is it a waste >> of time and I'll need to get a BSPT thread?

Thanks
Theo

As I said earlier, I would use a hemp wrap and jointing paste.

I agree that would work, but use potable water jointing paste! The traditional ones aren't. Don't know if hemp is approved.
--

Roger Hayter
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From Newsgroup: uk.d-i-y

Roger Hayter <roger@hayter.org> wrote:

On 22 Jun 2026 at 09:37:33 BST, "Sparky" <"somewhere else"@gmail.com> wrote:

Theo wrote:

John Rumm <see.my.signature@nowhere.null> wrote:

If you can't find an adaptor, you could always do it in steps; convert >>>> from 3/4" BSP TM to compression first, then go from that to something
you can mount your flexi on:

There's no space for anything else, I need to take an immediate turn upward.
There is barely enough space for the curve on the flexi as it is.

I haven't managed to find any 3/4" BSPT fittings locally. The reducers Alan
mentioned plus an elbow might work, but I'd have to order them in. If I can
find a 3/4" BSPT elbow then I have more space to adapt that to 1/2" BSPP. >>>

Jet V2 is non setting - it works as a lubricant, and helps make a final >>>> seal. You won't be able to use it at any thickness. So good for threads >>>> on compression joints (reduces squeaking, and requires less torque to
tighten), also as a thin film on mating surfaces like cone joints on on >>>> olives where it will seal very slight imperfections on the surface.

I've now got some Fernox LS-X, which seems to be basically silicone in a >>> tube. Is it worth trying to seal what I've got with that, or is it a waste >>> of time and I'll need to get a BSPT thread?

Thanks
Theo

As I said earlier, I would use a hemp wrap and jointing paste.

I agree that would work, but use potable water jointing paste! The traditional
ones aren't. Don't know if hemp is approved.

+1

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From Newsgroup: uk.d-i-y

On 22 Jun 2026 at 10:10:33 BST, "Roger Hayter" <roger@hayter.org> wrote:

On 21 Jun 2026 at 23:04:19 BST, "Theo" <theom+news@chiark.greenend.org.uk> wrote:

John Rumm <see.my.signature@nowhere.null> wrote:

If you can't find an adaptor, you could always do it in steps; convert
from 3/4" BSP TM to compression first, then go from that to something
you can mount your flexi on:

There's no space for anything else, I need to take an immediate turn upward. >> There is barely enough space for the curve on the flexi as it is.

I haven't managed to find any 3/4" BSPT fittings locally. The reducers Alan >> mentioned plus an elbow might work, but I'd have to order them in. If I can >> find a 3/4" BSPT elbow then I have more space to adapt that to 1/2" BSPP.

Jet V2 is non setting - it works as a lubricant, and helps make a final
seal. You won't be able to use it at any thickness. So good for threads
on compression joints (reduces squeaking, and requires less torque to
tighten), also as a thin film on mating surfaces like cone joints on on
olives where it will seal very slight imperfections on the surface.

I've now got some Fernox LS-X, which seems to be basically silicone in a
tube. Is it worth trying to seal what I've got with that, or is it a waste >> of time and I'll need to get a BSPT thread?

Thanks
Theo

I wouldn't trust it permanently, though it would probably work at first.

You can certainly get an adapter 1/2" to 3/4" taper male, the only question is
whether the flexi would fit far enough on the taper male 1/2" side. I suspect it would.

https://www.bes.co.uk/3-4in-x-1-2in-hexagon-reducing-nipple-bsp-taper-brass-10596/

And you could use an elbow to avoid a sharp bend in the flexi, although you're still stuck with a taper male thread.

https://www.bes.co.uk/brass-equal-elbow-threaded-male-x-female-1-2-10545/
--

Roger Hayter
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From Newsgroup: uk.d-i-y

On 22 Jun 2026 at 10:27:06 BST, "Roger Hayter" <roger@hayter.org> wrote:

On 22 Jun 2026 at 10:10:33 BST, "Roger Hayter" <roger@hayter.org> wrote:

On 21 Jun 2026 at 23:04:19 BST, "Theo" <theom+news@chiark.greenend.org.uk> >> wrote:

John Rumm <see.my.signature@nowhere.null> wrote:

If you can't find an adaptor, you could always do it in steps; convert >>>> from 3/4" BSP TM to compression first, then go from that to something
you can mount your flexi on:

There's no space for anything else, I need to take an immediate turn upward.
There is barely enough space for the curve on the flexi as it is.

I haven't managed to find any 3/4" BSPT fittings locally. The reducers Alan
mentioned plus an elbow might work, but I'd have to order them in. If I can
find a 3/4" BSPT elbow then I have more space to adapt that to 1/2" BSPP. >>>

Jet V2 is non setting - it works as a lubricant, and helps make a final >>>> seal. You won't be able to use it at any thickness. So good for threads >>>> on compression joints (reduces squeaking, and requires less torque to
tighten), also as a thin film on mating surfaces like cone joints on on >>>> olives where it will seal very slight imperfections on the surface.

I've now got some Fernox LS-X, which seems to be basically silicone in a >>> tube. Is it worth trying to seal what I've got with that, or is it a waste >>> of time and I'll need to get a BSPT thread?

Thanks
Theo

I wouldn't trust it permanently, though it would probably work at first.

You can certainly get an adapter 1/2" to 3/4" taper male, the only question is
whether the flexi would fit far enough on the taper male 1/2" side. I suspect
it would.


https://www.bes.co.uk/3-4in-x-1-2in-hexagon-reducing-nipple-bsp-taper-brass-10596/

And you could use an elbow to avoid a sharp bend in the flexi, although you're
still stuck with a taper male thread.

https://www.bes.co.uk/brass-equal-elbow-threaded-male-x-female-1-2-10545/

I would be interested in the collective wisdom about whether a die nut could
be used to convert a 1/2" male taper thread to parallel? Although you can get
a standard die for about -u4 if you have a suitable diestock.
--

Roger Hayter
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From Newsgroup: uk.d-i-y

Tricky Dicky wrote:

Roger Hayter <roger@hayter.org> wrote:

On 22 Jun 2026 at 09:37:33 BST, "Sparky" <"somewhere else"@gmail.com> wrote: >>

Theo wrote:

John Rumm <see.my.signature@nowhere.null> wrote:

If you can't find an adaptor, you could always do it in steps; convert >>>>> from 3/4" BSP TM to compression first, then go from that to something >>>>> you can mount your flexi on:

There's no space for anything else, I need to take an immediate turn upward.
There is barely enough space for the curve on the flexi as it is.

I haven't managed to find any 3/4" BSPT fittings locally. The reducers Alan
mentioned plus an elbow might work, but I'd have to order them in. If I can
find a 3/4" BSPT elbow then I have more space to adapt that to 1/2" BSPP. >>>>

Jet V2 is non setting - it works as a lubricant, and helps make a final >>>>> seal. You won't be able to use it at any thickness. So good for threads >>>>> on compression joints (reduces squeaking, and requires less torque to >>>>> tighten), also as a thin film on mating surfaces like cone joints on on >>>>> olives where it will seal very slight imperfections on the surface.

I've now got some Fernox LS-X, which seems to be basically silicone in a >>>> tube. Is it worth trying to seal what I've got with that, or is it a waste
of time and I'll need to get a BSPT thread?

Thanks
Theo

As I said earlier, I would use a hemp wrap and jointing paste.

I agree that would work, but use potable water jointing paste! The traditional
ones aren't. Don't know if hemp is approved.

+1

I fall on my sword - I hadn't spotted that this was for a water filter.
There are WRAS-approved pastes but hemp is not. A tapered fitting is
probably the only viable WRAS-approved solution
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From Newsgroup: uk.d-i-y

On 21/06/2026 23:04, Theo wrote:

John Rumm <see.my.signature@nowhere.null> wrote:

If you can't find an adaptor, you could always do it in steps; convert
from 3/4" BSP TM to compression first, then go from that to something
you can mount your flexi on:

There's no space for anything else, I need to take an immediate turn upward. There is barely enough space for the curve on the flexi as it is.

I haven't managed to find any 3/4" BSPT fittings locally. The reducers Alan mentioned plus an elbow might work, but I'd have to order them in. If I can find a 3/4" BSPT elbow then I have more space to adapt that to 1/2" BSPP.

Jet V2 is non setting - it works as a lubricant, and helps make a final
seal. You won't be able to use it at any thickness. So good for threads
on compression joints (reduces squeaking, and requires less torque to
tighten), also as a thin film on mating surfaces like cone joints on on
olives where it will seal very slight imperfections on the surface.

I've now got some Fernox LS-X, which seems to be basically silicone in a tube. Is it worth trying to seal what I've got with that, or is it a waste of time and I'll need to get a BSPT thread?

LSX will probably work. As would "enough" ptfe (using string rather than
the thin tape would probably work better). Hemp and V2 could also work.
--
Cheers,

John.

/=================================================================\
| Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk | \=================================================================/
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