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looks like dwv?

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looks like dwv?

Unread postAuthor: iknowmy3tables » Sat Dec 29, 2007 10:08 am

I need to order a sch40 4" tee for my gun's valve but this mcmasters part looks an awful lot like a dwv fitting, I know mcmaster messes up the pics from time to time but they also don't separate always dwv from sch40 in fact they often consider dwv as sch40
[url="4880K48"]http://www.mcmaster.com/itm/find.ASP?tab=find&context=psrchDtlLink&fasttrack=False&searchstring=4880K48[/url]
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Unread postAuthor: noob of noobs » Sat Dec 29, 2007 10:30 am

I think it looks like DWV. The sockets lok way too shallow for nsf, but I could be wrong.
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Unread postAuthor: bigbob12345 » Sat Dec 29, 2007 10:59 am

That could not possibly be nsf as noob of noobs said the sockets are too short and it also just has DWV look to it
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Unread postAuthor: PVC Arsenal 17 » Sat Dec 29, 2007 11:02 am

I ordered a 4" tee from McMaster and it was a LASCO pressure rated fitting. I was, however, disappointed in the knit lines.
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Unread postAuthor: mark.f » Sat Dec 29, 2007 11:38 am

Those pictures are deceiving. Even on their pressure rated fittings, the display picture shows up as a DWV fitting sometimes.

If it's schedule 40, look for ASTM D2466, and the NSF rating is usually "NSF-61". Go by what you read, not what you see.
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Unread postAuthor: pizlo » Sat Dec 29, 2007 12:59 pm

As mark said the pictures are NOT what you should base your assumptions on, If they say its pressure rated it is. But better safe then sorry, if it looks unstable you could contact mcmaster.
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Unread postAuthor: DYI » Sat Dec 29, 2007 3:46 pm

DWV usually is SCH40, its the pressure rating you're looking for. Mark's advice is correct. Look for NSF-61 or NSF-PW on PVC fittings, because logic would tell us that all potable water systems must use pressure for delivery, and therefore must be pressure rated. This line of thinking also explains why DWV can be pressure rated.
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Unread postAuthor: BigGrib » Sat Dec 29, 2007 4:23 pm

And looking at the picture, even though it looks like a dwv fitting remember that it's a 4" fitting and the scale might be a bit off, but once again you can't always judge by the picture.
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Unread postAuthor: iknowmy3tables » Sat Jan 05, 2008 3:46 pm

ok, arsenal what do you mean by kit lines do you mean that it doesn't come in standard shape
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Unread postAuthor: clide » Sat Jan 05, 2008 10:14 pm

Knit lines are very thin lines formed from multiple flows of plastic joining up again after flowing around the mold. They look like hairline cracks and usually aren't seen unless you are really looking for them.

Take a fitting and look very closely at the side opposite of the nub left from where the PVC was injected and you'll be able to see a faint line. It's probably easier to see on larger fittings.
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Unread postAuthor: frankrede » Sun Jan 06, 2008 1:51 am

clide wrote:Knit lines are very thin lines formed from multiple flows of plastic joining up again after flowing around the mold. They look like hairline cracks and usually aren't seen unless you are really looking for them.

Take a fitting and look very closely at the side opposite of the nub left from where the PVC was injected and you'll be able to see a faint line. It's probably easier to see on larger fittings.
I see it on my 4" sch 80 fittings:( do they compromise the strength in that area?
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Unread postAuthor: clide » Sun Jan 06, 2008 6:30 pm

frankrede wrote:I see it on my 4" sch 80 fittings:( do they compromise the strength in that area?


I don't think the strength is compromised, if it is then it is surely accounted for in the design since any fitting that has two flows converge will have them. The only fittings I can think of that wouldn't have them is caps and plugs
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Unread postAuthor: SpudMonster » Sun Jan 06, 2008 8:21 pm

For what it's worth, lasco fittings are just about the worst fittings you can buy. They will work fine for spudgun applications, but if you can find Spears or Duro fittings, they are WAY better.
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