Round pressure gauge vs. square back

[toofast]

Hopefully this makes sense...

My Waterco pump has a "rounded indentation" for a gauge and a o-ring.

All the gauges I find have SQUARE ends and when I tighten it the o-ring does not seat. This has leaked since day one and I would like to fix.

Any ideas where I can find a rounded back end to fit my round opening ?

Hopefully this picture will help.

 

[n240sxguy]

The square sides are so you can put a wrench on it. You shouldn't need an o-ring, just some Teflon tape on the threads. Was it not super hard to get the gauge to go in that far? Mine wouldn't go that far without a wrench most of the way.


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[toofast]

The square sides are so you can put a wrench on it. You shouldn't need an o-ring, just some Teflon tape on the threads. Was it not super hard to get the gauge to go in that far? Mine wouldn't go that far without a wrench most of the way.

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Mmmmm, I got a ton of Teflon (like 5-6 wraps) and I tightened by hand. Wonder if I have a different issue than I thought ?

 

[duraleigh]

Too much Teflon (2-3 turns is enough) and too many turns on the gauge.......it looks like it has bottomed out......maybe stripped.

 

[Richard320]

I'm wondering if that pump might have some oddball metric thread that's close, but not the same, as national pipe thread. I looked up the waterco website and looked at some manuals to see if it had a parts list, and it's in a bunch of languages. And no parts list.

 

[n240sxguy]

Gotta be something going on. Mine is 1/4"npt. I always use 5-6 turns of Teflon. Mine tightened up in 3-4 turns max. Npt is cut on a taper, so it should take incredible force to get it in that far.


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[toofast]

Yeah by all means I did not use incredible force I gotta believe it's some bizarre size.... I'm sure I can call Waterco and see what they say on the matter

 

[Bama Rambler]

It's most likely BSP parallel threads which require an o-ring. It would be close enough in size to a NPT tapered thread that it would fit, but it wouldn't seal.

 

[toofast]

Okay if that's the case what do I do

 

[Bama Rambler]

Grainger has them and I'm sure other places do as well.
Is it 1/4 or 1/8? 1/4 will actually be 1/2" OD and 1/8 will be 3/8" OD.
Also what size is the case? 40 or 50mm (1½" or 2")


They also make adapters from BSP to NPT.

 

[toofast]

Just to close the loop on this, I contact the MFG and they shared it is BSP thread. Since they are international, they have this "issue" to deal with.
Now I just gotta find one of these suckers....

 

[n240sxguy]

See if you can find a bsp to npt bushing, then you can buy the same type of gauge the other 90% of us use.


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[toofast]

Ok, so is this what I need ?

http://amzn.com/B004RCOY5O

The sizing looks wonky, but I am always confused on thread sizes. What I have now is a standard gauge, just like what is sold on TFP...and it FITS (well sort of)

So I have a 1/4" NPT male, so that means what I have above is wrong...and I need a 1/4 BSPT - 1/4 NPT, but low and behold I can't find one of those :-(

 

[Bama Rambler]

Here's one. It's a little expensive, but it's stainless steel.

Searching for 1/4 female npt to 1/4 male bspp should turn up more.

- - - Updated - - -

Here's a cheaper one from Zoro.

 

[n240sxguy]

Here's one. It's a little expensive, but it's stainless steel.

Searching for 1/4 female npt to 1/4 male bspp should turn up more.

- - - Updated - - -

Here's a cheaper one from Zoro.

I'd take the one from zoro. Jeez $24 for a stainless one!


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