Yes the Clippard MNV-4kw needs some adapters to connect directly to a regulator. Some people, like apparently Robert and others, sell the Clippard with one of the adapters, a 10/32 to 1/8 NPT. That is what I got when I bought mine. You then need a 1/8 to 1/4 NPT adapter. This info is found in my web site.
The swagelok B-SS4 is a great valve. Expensive relative to the Clippard but gives much finer/easier adjustment. However, once the clippard is set, you can forget it. I have only changed mine once since setting it. I don't even have to deal with it when I refill the tank.