Pressure gauge fitting size?

[nosole]

I have a Hayward Micro Clear DE4800 and recently had to replace the upper housing due to a crack. I found one second hand without a pressure regulator which isn’t a problem because I have one. The problem I’m having is finding the brass pipe fitting because the threads in the housing look very course and deep. I’ve found the correct diameter fitting, but the threads are too fine to make a complete seal.

Can someone please enlighten me as to the thread measurement or point to where I can find it?

thx

 

[Texas Splash]

Humm. Not sure my reply will be exactly what you are looking for, but assuming you are using the correct size gauge like the one seen HERE (1/4" NPT), and as long as the new housing female (gauge) receiver isn't damaged, they should fit together fine. Although we typically do use some Teflon tape around the threads as well to help with the seal.

 

[JamesW]

Hayward Adapter Assy., Relief Valve Gauge (dex2400s) - INYOPools.com

You need the adaptor and then a regular pressure gauge screws in to it.

Did the old adaptor not fit the new top?

 

[nosole]

Thanks guys.

James, no the old adapter does not fit/seal. After seeing your reference part, it looks like mine is just a generic assembly with a gauge (like Tex listed) attached to a T with a pressure relief valve. The Hayward specific part you show looks OEM because the threads on the male portion definitely look like they will fit the female of the housing. I’d really rather not pay $30+ for such a simple piece and was hoping to find a generic brass fitting. But I’m also guessing that threading is intentionally a specialty size so Hayward can sell their proprietary parts.

Do you know the size for that male threading?

 

[JamesW]

I don't know the thread size.

How did the adaptor fit the old top if they are the same top?

 

[cfherrman]

If it's finer threads than a npt, I'd try a straight hydraulic fitting with the o ring seal

 

[Texas Splash]

I’d really rather not pay $30+ for such a simple piece and was hoping to find a generic brass fitting. But I’m also guessing that threading is intentionally a specialty size so Hayward can sell their proprietary parts.

I hear you nosole! I too will do what I can to save a few bucks - as long as it's safe. In your case, it sounds as if at some point, the original part(s) were modified, and you would ideally like to get everything back together at the lowest cost. We've had many discussion here about filters as pressurized vessels, repairs, and modifications. A gauge may not seem like much, and what you're trying may work fine. But in the end, it's still attached to a pressurized vessel. The last thing you want is later for that thing to come lose and blow off like a bullet because something didn't mate-up good enough. So I'll simply emphasize a TFP note of caution about using parts originally designed for the filter. Safety first is all I'm saying. :blah:

 

[JamesW]

I don't think that it's an npt thread. I think that it might be a coarse bolt thread.

I don't think that you will find a generic fitting.

 

[PoolguyinCT]

They don’t make proprietary threads as an aftermarket moneygrab, proprietary threads are to keep consumers or field techs from altering the OEM & creating their own “products.”

 

[Bama Rambler]

I know not much less, but Amazon has that fitting for less than $20.