A domestic equivalent to the Larox rubber pinch valve?
Larox's core business is filter presses. They developed their valve to replace Neles metal seated ball valves. So one option you have is to consider Neles.
The other gentlemen mentioned RedValve. You'll like the price of that but I don't think it should be considered an "equal".
You mentioned a "domestic" source for Larox. You are aware that they have assembly in Maryland?
Besides Redvalve and its RKL subsidiary, other pinch valve manufacturers could be many.
For smaller sizes another type valve to consider might be the diaphragm valve as somewhat similar to a pinch valve.

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