You are probably talking about the bypass blocks for the Super A, C, Super C that are sold by a gentleman in Buffalo. He also makes a version for the Cub.
The 340U is a completely different hydraulic design from those older tractors, so this bypass block won't work. There is no bypass block for the 340U because it doesn't need one.
The 340U's hydraulic system is designed for remote cylinders. You can stack up to two more valves with the one you already have for two remotes and the 3pt hitch.
The valves are the same across all models from that time. 240, 340, 460 and 560 all used them, so you should be able to find what you need at a salvage yard. You can get a diagram by surfing to the parts search page at caseih.com.
In fact, make sure you don't already have two or three valves.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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