I've had complaints about all diaphragm gates rupturing under high pressure air from the top port.
This is why all of our stuff is piston.
400r are in stock for the moment, 500Rs are waiting on clamps.
Clamps ship hopefully on the 18th but it'll be the 24th till we can ship.
The std. 500s don't have a pressure problem , mainly just less convenient.
With HP air available you won't know the difference.
Ask for p/n TK260-D, it'll come preloaded w/ the heavy springs.
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Lance Humbert
JGS Precision Turbo Control Products
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