These spheres are just terrific for your mono or bi-propellant project. We've selected these sizes to fit in 4" and 6" diameter vehicles with enough side room for wiring and piping. 

The sphere on the left is 3.5" OD with 1/8 NPT fitting. 
Pressure rating from manufacturer is 700 PSI with wall thickness is 20 gauge. 

The sphere on the right is 5.5" OD with 1/4 NPT fitting.
Pressure rating from manufacturer is 400 PSI with wall thickness of 20 gauge.

Both vessels have been proof tested over 1,500 PSI.

Neither vessel is DOT rated and should never be pressurized while in proximity! 
Both are 304 Stainless, 316 Stainless is available on request for an additional charge.

5.5" Sphere 
3.5" Sphere

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Stainless steel spherical tanks with threaded connectors from 2" OD through 14" OD are available on special request.  Tell us your size requirements and we'll supply you a tank, just like that.

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