I'm trying to revive an old airless paint sprayer (Wagner W500) and
made decent progress until I met the fitting on the paint reservoir.

The male thread OD appears to be close to 0.850" with a pitch of 0.125
though it's a German product so likely not made to Imperial measurements.
The male fitting ends in something resembling a slender male flare. But,
the threads are too coarse for any flare I've ever seen.

The reservoir is plastic molded around a female brass insert. The plastic
has cracked radially, allowing paint to leak around the periphery of the
brass insert. There's no easy way to seal the cracks and they'll likely
keep growing anyway. A new reservoir is hard to find and expensive,
$100-$200 depending on where I look, with lots of "out of stock" notes.
There don't seem to be any aftermarket suction hose kits, as this pump
is top-inlet and the modern types are all bottom-inlet.

Does anybody recognize those dimensions as any standard fitting type?
I _think_ the path of least resistance will be to fabricate a suction
pickup hose. If there do exist "standard" fittings of this type that
seems the place to start. If the threads are orphans I could try to
fabricate something cobbled up using the brass insert as a foundation.

Thanks for reading, I think mentioning "brass" makes this an on-topic
post 8-)

bob prohaska

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On Wed, 23 Apr 2025 16:44:40 -0000 (UTC)
bp@www.zefox.net wrote:

I'm trying to revive an old airless paint sprayer (Wagner W500) and
made decent progress until I met the fitting on the paint reservoir.

<snip>

Is this two page parts pdf your machine? If so pass on the part number
and page you're talking about. Would help to visualize the part...

https://airless.com.au/documents/Wagner-W500-Manual.pdf

Maybe #11 on page 2?

--
Leon Fisk
Grand Rapids MI

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Leon Fisk <lfiskgr@gmail.invalid> wrote:

On Wed, 23 Apr 2025 16:44:40 -0000 (UTC)
bp@www.zefox.net wrote:

I'm trying to revive an old airless paint sprayer (Wagner W500) and
made decent progress until I met the fitting on the paint reservoir.

<snip>

Is this two page parts pdf your machine? If so pass on the part number
and page you're talking about. Would help to visualize the part...

https://airless.com.au/documents/Wagner-W500-Manual.pdf

Maybe #11 on page 2?

Yes on all counts. I've put a photo at http://www.zefox.net/~bp/wagner_paint_sprayer/inlet_port.JPG
Perhaps the oddest thing is the rounded thread profile, almost
like a Whitworth pattern.

Wagner claims to have the reservoir in stock for $135, but I'd
like to see how the sprayer behaves using a pickup tube. The bore
of the fitting is 13 mm, so a half inch tube will fit inside, an
o-ring over the tube can form a gland seal if I convert the brass
insert into a compression nut.

Thanks for writing,

bob prohaska

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On Wed, 23 Apr 2025 23:57:40 -0000 (UTC), bp@www.zefox.net wrote:

Leon Fisk <lfiskgr@gmail.invalid> wrote:

On Wed, 23 Apr 2025 16:44:40 -0000 (UTC)
bp@www.zefox.net wrote:

I'm trying to revive an old airless paint sprayer (Wagner W500) and
made decent progress until I met the fitting on the paint reservoir.

<snip>

Is this two page parts pdf your machine? If so pass on the part number
and page you're talking about. Would help to visualize the part...

https://airless.com.au/documents/Wagner-W500-Manual.pdf

Maybe #11 on page 2?

Yes on all counts. I've put a photo at >http://www.zefox.net/~bp/wagner_paint_sprayer/inlet_port.JPG
Perhaps the oddest thing is the rounded thread profile, almost
like a Whitworth pattern.

Wagner claims to have the reservoir in stock for $135, but I'd
like to see how the sprayer behaves using a pickup tube. The bore
of the fitting is 13 mm, so a half inch tube will fit inside, an
o-ring over the tube can form a gland seal if I convert the brass
insert into a compression nut.

Thanks for writing,

bob prohaska

There is a standard thread that looks like that listed in Machinery's
Handbook. Something like Dardelet.

Joe

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On Wed, 23 Apr 2025 23:57:40 -0000 (UTC)
bp@www.zefox.net wrote:

<snip>

but I'd like to see how the sprayer behaves using a pickup tube...

Those look like threads I've seen used with plastic fittings...

I'd be tempted to find a hose with a tight fit pushed on over
that thread. Maybe put an o-ring on the portion before where the thread
starts. Use a radiator clamp on the hose to seal it. A tie-wrap might
even work. Should be good enough for testing. It's not going to be
sucking that hard and you could always place the paint container higher
than the intake. It would tend to siphon the paint into the pump
then too...

--
Leon Fisk
Grand Rapids MI

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On Wed, 23 Apr 2025 23:57:40 -0000 (UTC)
bp@www.zefox.net wrote:

<snip"

Perhaps the oddest thing is the rounded thread profile, almost
like a Whitworth pattern.

Wiki has a page for:

"Knuckle threads or round threads are an unusual highly rounded
thread form. The large space between the rounded crests and roots
provides space for debris to be shifted to not interfere with the
thread, making this form resistant to debris and thread damage."

https://en.wikipedia.org/wiki/Knuckle_thread

With a high tolerance for debris in the threads their use in this paint application would make a lot of sense...

--
Leon Fisk
Grand Rapids MI

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Leon Fisk <lfiskgr@gmail.invalid> wrote:

On Wed, 23 Apr 2025 23:57:40 -0000 (UTC)
bp@www.zefox.net wrote:

<snip"

Perhaps the oddest thing is the rounded thread profile, almost
like a Whitworth pattern.

Wiki has a page for:

"Knuckle threads or round threads are an unusual highly rounded
thread form. The large space between the rounded crests and roots
provides space for debris to be shifted to not interfere with the
thread, making this form resistant to debris and thread damage."

https://en.wikipedia.org/wiki/Knuckle_thread

With a high tolerance for debris in the threads their use in this paint application would make a lot of sense...

I think that's probably it. German standard, too 8-)

Looks like there's a "Wagner Tooling Systems" company too, though I can't discern any direct connection to Wagner painting equipment.

Unfortunately, I don't find any source of small fittings based on the
thread. McMaster-Carr sells leadscrews and nuts, but that's it.

Thanks for writing!

bob prohaska

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On Thu, 24 Apr 2025 10:12:13 -0400, Leon Fisk <lfiskgr@gmail.invalid>
wrote:

On Wed, 23 Apr 2025 23:57:40 -0000 (UTC)
bp@www.zefox.net wrote:

<snip"

Perhaps the oddest thing is the rounded thread profile, almost
like a Whitworth pattern.

Wiki has a page for:

"Knuckle threads or round threads are an unusual highly rounded
thread form. The large space between the rounded crests and roots
provides space for debris to be shifted to not interfere with the
thread, making this form resistant to debris and thread damage."

https://en.wikipedia.org/wiki/Knuckle_thread

With a high tolerance for debris in the threads their use in this paint >application would make a lot of sense...

DIN 405-2 is it. Lots of German sources.

There is no US equivalent. But 405 uses 8 and 10 threads per inch.

Dardelet is unrelated, and older copies of Machinery's Handbook don't
cover knuckle threads.

Joe

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