SpudFiles

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
http://www.mcmaster.com/itm/find.ASP?tab=find&context=psrchDtlLink&fasttrack=False&searchstring=4880K48

I think it looks like DWV. The sockets lok way too shallow for nsf, but I could be wrong.

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

I ordered a 4" tee from McMaster and it was a LASCO pressure rated fitting. I was, however, disappointed in the knit lines.

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.

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.

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.

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.

ok, arsenal what do you mean by kit lines do you mean that it doesn't come in standard shape

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.

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?

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

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.