If you have filled cylinders with 200 and 300 Bar DIN valves then you have probably used the really annoying one-piece DIN-to-Yoke fill blocks. The Premium DIN-to-Yoke Fill Adapter is a much better solution because it uses the same system for connecting to the cylinder valve as scuba regulators. This premium fill adapter has a knurled metal hand wheel for easy attachment and removal, no wrench needed. Even better, because you can orient the yoke fitting a full 360°, the adapter adjusts to accommodate the orientation of the fill whip, not the other way around. That means no more fighting with the whip to attach it to the cylinder.
The adapter accepts standard size o-rings and fits all 200-Bar and 300-Bar DIN valves, but this adapter is suitable for filling only.
I have 300bar DIN Thermo valves and I had problems with it seating. The DGX support team (Mark/Ian) were great responding and supporting. As it turns out my issue was that the lower threads near the seat of the internal of the valve get rarely used (most regs are 200Bar DIN) and so the lower threads get a little more buildup of junk which adds to the resistance. I was hesitant to tighten more than hand-tight since the valve metal is brass. So if you are using 300Bar DIN valves clean and uses a little force (adjustable pliers) the first go-around. After that it works great with hand-tight torque.
