Nothing new about the valve in question. It appears to be the old Parker Brothers valve from many years ago.

http://www.thecarburetorshop.com/Fuel_valves.htm

As to the FLAPS aftermarket repair kits:

There are currently 3 manufacturers (of which I am aware) that produce the aftermarket kits. Regardless of what name is on the box, the inner kit comes from one of these three. I don't know much about one (don't like their parts), but the other two have a rough guideline that if they do not sell 1000 of any given kit in a year, they obsolete the kit.

Speciality carburetor kit manufacturers do not have such criteria.

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop