Tom is right-on with the stainless,and there is also brass available in class 
300
fittings & valves.You may have to go to a "Fluid Power" supply house such as
Parker.These valves & fittings look strange,like square blocks rather than nice
round shapes,but they work.The supplier you use for other specialty items
should be able to direct you to a sourcefor these.Good luck!

 
---- Tom Duross <[email protected]> wrote: 
> I have a hotel in Boston I used to do, 400# churn, stainless sensing lines
> and fittings.
> 
> Tom
> 
> 
> 
> To further emphasis what Ron said, these fittings are called CLASS 150
> (thats for malleable whereas Cast is Class 125).  That is not it's
> rated pressure allowance. The max pressure is indeed 300 psi for
> malleable fittings but only for up to 6 inch.
> 
> Roland
> 
> On Aug 10, 2009, at 1:53 PM, Ron Greenman wrote:
> 
> > If I'm not mistaken, and I have been once before, the rating written
> > on the fitting (typically 150 psi) is the steam fitting rating. The
> > water rating is twice that.
> 
> 
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